QUIDEL CORP /DE/
EXHIBIT 10.24: SECURITY AGMT BTWN QUIDEL/COMERICA
<DOCUMENT>
<TYPE>EX-10.24
<SEQUENCE>5
<FILENAME>a2091002zex-10_24.htm
<DESCRIPTION>EXHIBIT 10.24: SECURITY AGMT BTWN QUIDEL/COMERICA
<TEXT>
<HTML>
<HEAD>

</HEAD>
<BODY BGCOLOR="#FFFFFF" LINK=BLUE  VLINK=PURPLE>
<BR>
<FONT SIZE=3 ><A HREF="#02SAN1765_4">QuickLinks</A></FONT>
<font size=3> -- Click here to rapidly navigate through this document</font>
<P ALIGN="RIGHT"><FONT SIZE=2><A
NAME="page_ko1834_1_1"> </A> </FONT></P>

<!-- TOC_END -->
<P ALIGN="RIGHT"><FONT SIZE=2><A
NAME="ko1834_exhibit_10.24"> </A>
<A NAME="toc_ko1834_1"> </A>
<BR></FONT><FONT SIZE=2><B>Exhibit 10.24    <BR>  </B></FONT></P>

<P><FONT SIZE=2><B>
<IMG SRC="g49060.jpg" ALT="LOGO" WIDTH="145" HEIGHT="33">
  </B></FONT></P>

<P ALIGN="CENTER"><FONT SIZE=2><A
NAME="ko1834_security_agreement"> </A>
<A NAME="toc_ko1834_2"> </A>
<BR></FONT><FONT SIZE=2><B>Security Agreement    <BR>  </B></FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As of </FONT><FONT SIZE=2><I>August&nbsp;29, 2002</I></FONT><FONT SIZE=2>, for value received, the undersigned ("Debtor") pledges, assigns and grants to
Comerica Bank-California ("Bank"), a California banking corporation, whose address is </FONT><FONT SIZE=2><I>333 West Santa Clara Street, San Jose, CA 95113</I></FONT><FONT SIZE=2>,
Attention: </FONT><FONT SIZE=2><I>Commercial Loan Documentation</I></FONT><FONT SIZE=2>, Mail Code </FONT><FONT SIZE=2><I>4770</I></FONT><FONT SIZE=2>, a continuing security interest and lien (any
pledge, assignment, security interest or other lien arising hereunder is sometimes referred to herein as a "security interest") in the collateral (as defined below) to secure payment when due, whether
by stated maturity, demand acceleration or otherwise, of all existing and future indebtedness ("Indebtedness") to the Bank
of&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;("Borrower") and/or Debtor. Indebtedness includes without
limit any and all obligations or liabilities of the Borrower and/or Debtor to the Bank, whether absolute or contingent, direct or indirect, voluntary or involuntary, liquidated or unliquidated, joint
or several, known or unknown; any and all obligations or liabilities for which the Borrower and/or Debtor would otherwise be liable to the Bank were it not for the invalidity or unenforceability of
them by reason of any bankruptcy, insolvency or other law, or for any other reason; any and all amendments, modifications, renewals and/or extensions of any of the above; all costs incurred by Bank in
establishing, determining, continuing, or defending the validity or priority of its security interest, or in pursuing its rights and remedies under this Agreement or under any other agreement between
Bank and Borrower and/or Debtor or in connection with any proceeding involving Bank as a result of any financial accommodation to Borrower and/or Debtor; and all other costs of collecting
Indebtedness, including without limit reasonable attorney fees. Debtor agrees to pay Bank all such costs incurred by the Bank, immediately upon demand, and until paid all costs shall bear interest at
the highest per annum rate applicable to any of the Indebtedness, but not in excess of the maximum rate permitted by law. Any reference in this Agreement to attorney fees shall be deemed a reference
to reasonable fees, costs, and expenses of both in-house and outside counsel and paralegals, whether inside or outside counsel is used, whether or not a suit or action is instituted, and
to court costs if a suit or action is instituted, and whether attorney fees or court costs are incurred at the trial court level, on
appeal, in a bankruptcy, administrative or probate proceeding or otherwise. Debtor further covenants, agrees and represents as follows: </FONT></P>

<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>1.</FONT></DT><DD><FONT SIZE=2>Collateral
shall mean all of the following property Debtor now or later owns or has an interest in, wherever located:
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
Accounts Receivable (for purposes of this Agreement, "Accounts Receivable" consists of all accounts, general intangibles, chattel paper (including
without limit electronic chattel paper and tangible chattel paper),contract rights, deposit accounts, documents, instruments and rights to payment evidenced by chattel paper, documents or instruments
health care insurance receivables, commercial tort claims, letters of credit, letter of credit rights, supporting obligations, and rights to payment for money or funds advanced or sold),
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
Inventory,
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
Equipment and Fixtures,
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
Software (for purposes of this Agreement "Software" consists of all (i)&nbsp;computer programs and supporting information provided in connection with a
transaction relating to the program, and (ii)&nbsp;computer programs embedded in goods and any supporting information provided in connection with a transaction relating to the program whether or not
the program is associated with the goods in such a manner that it customarily is considered part of the goods, and whether or not, by becoming the owner of the goods, a person acquires a right to use
the program in connection with the goods, </FONT></DD></DL>
<P ALIGN="CENTER"><FONT SIZE=2>1</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=1,SEQ=1,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=964444,FOLIO='1',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_2"> </A>
<UL>

<P><FONT SIZE=2>and
whether or not the program is embedded in goods that consist solely of the medium in which the program is embedded), </FONT></P>

</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>specific
items listed below and/or on attached Schedule&nbsp;A, if any, is/are also included in Collateral:
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
goods, instruments, documents, policies and certificates of insurance, deposits, money or other property (except real property which is not a fixture)
which are now or later in possession of Bank, or as to which Bank now or later controls possession by documents or otherwise, and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD><FONT SIZE=2>all
additions, attachments, accessions, parts, replacements, substitutions, renewals, interest, dividends distributions, rights of any kind (including but
not limited to stock splits, stock rights, voting and preferential rights), products, and proceeds of or pertaining to the above including, without limit, cash
or other property which were proceeds and are recovered by a bankruptcy trustee or otherwise as a preferential transfer by Debtor. </FONT></DD></DL>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
the definition of Collateral, a reference to a type of collateral shall not be limited by a separate reference more specific or narrower type of that collateral. </FONT></P>

<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.</FONT></DT><DD><FONT SIZE=2>Warranties,
Covenants and Agreements. Debtor warrants, covenants and agrees as follows:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.1</FONT></DT><DD><FONT SIZE=2>Debtor
shall furnish to Bank, in form and at intervals as Bank may reasonably request, any information Bank may reasonably request and allow Bank to examine, inspect, and copy any of
Debtor's financial books and records. Debtor shall, at the request of Bank, mark its records and the Collateral to clearly indicate the security interest of Bank under this Agreement.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.2</FONT></DT><DD><FONT SIZE=2>At
the time any Collateral becomes, or is represented to be, subject to a security interest in favor of Bank Debtor shall be deemed to have warranted that (a)&nbsp;Debtor is the
lawful owner of the Collateral and has the right and authority to subject it to a security interest granted to Bank; (b)&nbsp;none of the Collateral is subject to any security interest other than a
Permitted Lien (as defined in that certain Business Loan Agreement of even date herewith executed by Debtor as Borrower) or that in favor of Bank; (c)&nbsp;there are no financing statements on file,
other than in favor of Bank or with respect to Permitted Liens; and (d)&nbsp;no person, other than Bank, has possession or control (as defined in the Uniform Commercial Code) of any Collateral of
such nature that perfection of a security interest may be accomplished by control.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.3</FONT></DT><DD><FONT SIZE=2>Debtor
will keep the Collateral free at all times from all claims, liens, security interests and encumbrances other than those in favor of Bank and any Permitted Liens. Debtor will
not, without the prior written consent of Bank, sell, transfer or lease, or permit to be sold, transferred or leased, any or all of the Collateral in excess of $1,000,000 in any one (1)&nbsp;fiscal
year, except (where Inventory is pledged as Collateral) for Inventory in the ordinary course of its business and except for sales of Debtor's Assets not in the ordinary course of business that do not
exceed $1,000,000 in the aggregate in any one fiscal year. Bank or its representatives may at all reasonable times inspect the Collateral and may enter upon all premises where the Collateral is kept
or might be located.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.4</FONT></DT><DD><FONT SIZE=2>Debtor
will do all acts and will execute or cause to be executed all writings reasonably requested by Bank to establish, maintain and continue an exclusive, perfected and first
security interest of Bank in the Collateral, except with respect to Permitted Liens. Debtor agrees that Bank has no obligation to acquire or perfect any lien on or security interest in any asset(s),
whether realty or personalty, to secure payment of the Indebtedness, and Debtor is not relying upon assets in which the Bank may have a lien or security interest for payment of the indebtedness.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.5</FONT></DT><DD><FONT SIZE=2>Debtor
will pay within the time that they can be paid without interest or penalty all taxes, assessments and similar charges which at any time are or may become a lien, charge, or
encumbrance upon any Collateral, except to the extent contested in good faith by </FONT></DD></DL>
</DD></DL>
<P ALIGN="CENTER"><FONT SIZE=2>2</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=2,SEQ=2,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=34857,FOLIO='2',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_3"> </A>
<UL>
<UL>

<P><FONT SIZE=2>appropriated
proceedings and reserved on Borrower's books to the extent required by generally accepted accounting practice and deemed adequate by Borrower. If Debtor fails to pay any of these taxes,
assessments, or other charges in the time provided above, Bank has the option (but not the obligation) to do so and Debtor agrees to repay all amounts so expended by Bank immediately upon demand,
together with interest at the highest lawful default rate which could be charged by Bank on any Indebtedness. </FONT></P>

</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.6</FONT></DT><DD><FONT SIZE=2>Debtor
will keep the Collateral in good condition and will protect it from loss, damage, or deterioration from any cause. Debtor has and will maintain at all times (a)&nbsp;with
respect to the Collateral, insurance under an "all risk" policy against fire and other risks customarily insured against, and (b)&nbsp;public liability insurance and other insurance as may be
required by law or reasonably required by Bank, all of which insurance shall be in amount, form and content, and written by companies as may be reasonably satisfactory to Bank, containing a lender's
loss payable endorsement acceptable to Bank. Debtor will deliver to Bank promptly upon request evidence satisfactory to Bank that the required insurance has been procured. If Debtor fails to maintain
satisfactory insurance Bank has the option (but not the obligation) to do so and Debtor agrees to repay all amounts so expended by Bank immediately upon demand, together with interest at the highest
lawful default rate which could be charged by Bank on any Indebtedness.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.7</FONT></DT><DD><FONT SIZE=2>On
each occasion on which Debtor evidences to Bank the account balances on and the nature and extent of the Accounts Receivable, Debtor shall be deemed to have warranted that except
as otherwise indicated (a)&nbsp;each of those Accounts Receivable is valid and enforceable without performance by Debtor of any act; (b)&nbsp;each of those account balances are in fact owing,
(c)&nbsp;there are no setoffs, recoupments, credits, contra accounts, counterclaims or defenses against any of those Accounts Receivable, (d)&nbsp;as to any Accounts Receivable represented by a
note, trade acceptance, draft or other instrument or by any chattel paper or document, the same have been endorsed and/or delivered by Debtor to Bank, (e)&nbsp;Debtor has not received with respect
to any Account Receivable, any notice of the death of the related account debtor, nor of the dissolution, liquidation, termination of existence, insolvency, business failure, appointment of a receiver
for, assignment for the benefit of creditors by, or filing of a petition in bankruptcy by or against, the account debtor, and (f)&nbsp;as to each Account Receivable, except as may be expressly
permitted by Bank to the contrary in another document, the account debtor is not an affiliate of Debtor. Debtor will do all acts and will execute all writings reasonably requested by Bank to perform,
enforce performance of, and collect all Accounts Receivable. Debtor shall neither make nor permit any modification, compromise or substitution for Account Receivables greater than 10% of Debtor's
total Accounts Receivable without the prior written consent of Bank. Debtor shall, at Bank's request, arrange for verification of Accounts Receivable directly with account debtors or by other methods
acceptable to Bank.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.8</FONT></DT><DD><FONT SIZE=2>Debtor
at all times shall be in material compliance with all applicable laws, including without limit any laws, ordinances, directives, orders, statutes, or regulations an object of
which is to regulate or improve health, safety, or the environment ("Environmental Laws").
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.9</FONT></DT><DD><FONT SIZE=2>If
Bank, acting in its sole discretion, redelivers Collateral to Debtor or Debtor's designee for the purpose of (a)&nbsp;the ultimate sale or exchange thereof; or
(b)&nbsp;presentation, collection, renewal, or registration of transfer thereof; or (c)&nbsp;loading, unloading, storing, shipping, transshipping, manufacturing, processing or otherwise dealing
with it preliminary to sale or exchange; such redelivery shall be in trust for the benefit of Bank and shall not constitute a release of Bank's security interest in it or in the proceeds or products
of it unless Bank specifically so agrees in writing. If Debtor requests any such redelivery, Debtor will deliver with such request a duty executed financing statement in form and substance
satisfactory to </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>3</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=3,SEQ=3,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=686547,FOLIO='3',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_4"> </A>
<UL>
<UL>

<P><FONT SIZE=2>Bank.
Any proceeds of Collateral coming into Debtor's possession as a result of any such redelivery shall be held in trust for Bank and immediately delivered to Bank for application on the
Indebtedness. Bank may (in its sole discretion) deliver any or all of the Collateral to Debtor, and such delivery by Bank shall discharge Bank from all liability or responsibility for such Collateral.
Upon the occurrence and during the continuance of an Event of Default, Bank, at its option, may require delivery of any Collateral to Bank at any time with such endorsements or assignments of the
Collateral as Bank may request. </FONT></P>

</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.10</FONT></DT><DD><FONT SIZE=2>At
any time and without notice, Bank may, as to Collateral other than Equipment, Fixtures or Inventory, (a)&nbsp;cause any or all of such Collateral to be transferred to its name
or to the name of its nominees; (b)&nbsp;receive or collect by legal proceedings or otherwise all dividends, interest, principal payments and other sums and all other distributions at any time
payable or receivable on account of such Collateral, and hold the same as Collateral or apply the same to the Indebtedness, the manner and distribution of the application to be in the sole discretion
of Bank; (c)&nbsp;enter into any extension, subordination, reorganization, deposit, merger or consolidation agreement or any other agreement relating to or affecting such Collateral, and deposit or
surrender control of such Collateral, and accept other property in exchange for such Collateral and hold or apply the property or money so received pursuant to this Agreement; and (d)&nbsp;take such
actions in its own name or in Debtor's name as Bank, in its sole discretion, deems necessary or appropriate to establish exclusive control (as defined in the Uniform Commercial Code) over any
Collateral of such nature that perfection of the Bank's security interest may be accomplished by control.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.11</FONT></DT><DD><FONT SIZE=2>Bank
may assign any of the Indebtedness and deliver any or all of the Collateral to its assignee, who then shall have with respect to Collateral so delivered all the rights and
powers of Bank under this Agreement, and after that Bank shall be fully discharged from all liability and responsibility with respect to Collateral so delivered.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.12</FONT></DT><DD><FONT SIZE=2>Debtor
delivers this Agreement based solely on Debtor's independent investigation of (or decision not to investigate) the financial condition of Borrower and is not relying on any
information furnished by Bank. Debtor assumes full responsibility for obtaining any further information concerning the Borrower's financial condition, the status of the Indebtedness or any other
matter which the undersigned may deem necessary or appropriate now or later. Debtor waives any duty on the part of Bank, and agrees that Debtor is not relying upon nor expecting Bank to disclose to
Debtor any fact now or later known by Bank, whether relating to the operations or condition of Borrower, the existence, liabilities or financial condition of any guarantor of the Indebtedness, the
occurrence of any
default with respect to the Indebtedness, or otherwise, notwithstanding any effect such fact may have upon Debtor's risk or Debtor's rights against Borrower. Debtor knowingly accepts the full range of
risk encompassed in this Agreement, which risk includes without limit the possibility that Borrower may incur Indebtedness to Bank after the financial condition of Borrower, or Borrower's ability to
pay debts as they mature, has deteriorated.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>2.13</FONT></DT><DD><FONT SIZE=2>Debtor
shall defend, indemnify and hold harmless Bank, its employees, agents, shareholders, affiliates, officers, and directors from and against any and all claims, damages, fines,
expenses, liabilities or causes of action of whatever kind, including without limit reasonable consultant fees, legal expenses, and attorney fees, suffered by any of them as a direct or indirect
result of any actual or asserted violation of any law by Debtor, including, without limit, Environmental Laws, or of any remediation relating to any property required by any law, including without
limit Environmental Laws, INCLUDING ANY CLAIMS, DAMAGES, FINES, EXPENSES, LIABILITIES OR CAUSES OF ACTION OF WHATEVER KIND RESULTING FROM BANK'S OWN NEGLIGENCE, except and to the extent (but only to
the extent) caused by Bank's gross negligence or wilful misconduct. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>4</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=4,SEQ=4,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=860681,FOLIO='4',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_5"> </A>
<UL>
<UL>
</UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>3.</FONT></DT><DD><FONT SIZE=2>Collection
of Proceeds.
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>3.1</FONT></DT><DD><FONT SIZE=2>Debtor
agrees to collect and enforce payment of all Collateral until Bank shall direct Debtor to the contrary. Immediately upon notice, after the occurrence and during the continuance
of an Event of Default, to Debtor by Bank and at all times after that, Debtor agrees to fully and promptly cooperate and assist Bank in the collection and enforcement of all Collateral and to hold in
trust for Bank all payments received in connection with Collateral and from the sale, lease or other disposition of any Collateral, all rights by way of suretyship or guaranty and all rights in the
nature of a lien or security interest which Debtor now or later has regarding Collateral. Immediately upon and after such notice, Debtor agrees to (a)&nbsp;endorse to Bank and immediately deliver to
Bank all payments received on Collateral or from the sale, lease or other disposition of any Collateral or arising from any other rights or interests of Debtor in the Collateral, in the form received
by Debtor without commingling with any other funds, and (b)&nbsp;immediately deliver to Bank all property in Debtor's possession or later coming into Debtor's possession through enforcement of
Debtor's rights or interests in the Collateral. Debtor irrevocably authorizes Bank or any Bank employee or agent to endorse the name of Debtor upon any checks or other items which are received in
payment for any Collateral, and to do any and all things necessary in order to reduce these items to money. Bank shall have no duty as to the collection or protection of Collateral or the proceeds of
it, nor as to the preservation of any related rights, beyond the use of reasonable care in the custody and preservation of Collateral in the possession of Bank. Debtor agrees to take all steps
necessary to preserve rights against prior parties with respect to the Collateral. Nothing in this Section&nbsp;3.1 shall be deemed a consent by Bank to any sale, lease or other disposition of any
Collateral.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>3.2</FONT></DT><DD><FONT SIZE=2>Debtor
agrees that immediately upon Bank's request, upon the occurrence and during the continuance of an Event of Default the indebtedness shall be on a "remittance basis" as follows:
Debtor shall at its sole expense establish and maintain (and Bank at Bank's option, may establish and maintain at Debtor's expense): (a)&nbsp;an United States Post Office lock box (the "Lock Box"),
to which Bank shall have exclusive access and control. Debtor expressly authorizes Bank, from time to time, to remove contents from the Lock Box, for disposition in accordance with this Agreement.
Debtor agrees to notify all account debtors and other parties obligated to Debtor that all payments made to Debtor (other than payments by electronic funds transfer) shall be remitted, for the credit
of Debtor, to the Lock Box, and Debtor shall include a like statement on all invoices; and (b)&nbsp;a non-interest bearing deposit account with Bank which shall be titled as designated
by Bank (the "Cash Collateral Account") to which Bank shall have exclusive access and control. Debtor agrees to notify all account debtors and other parties obligated to Debtor that all payments made
to Debtor by electronic funds transfer shall be remitted to the Cash Collateral Account, and Debtor, at Bank's request, shall include a like statement on all invoices. Debtor shall execute all
documents and authorizations as required by Bank to establish and maintain the Lock Box and the Cash Collateral Account.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>3.3</FONT></DT><DD><FONT SIZE=2>All
items or amounts which are remitted to the Lock Box, to the Cash Collateral Account, or otherwise delivered by or for the benefit of Debtor to Bank on account of partial or full
payment of, or with respect to, any Collateral shalt, at Bank's option, (a)&nbsp;be applied to the payment of the Indebtedness, whether then due or not, in such order or at such time of application
as Bank may determine in its sole discretion, or, (b)&nbsp;be deposited to the Cash Collateral Account. Debtor agrees that Bank shall not be liable for any loss or damage which Debtor may suffer as
a result of Bank's processing of items or its exercise of any other rights or remedies under this Agreement, including without limitation indirect, special or consequential damages, loss of revenues
or profits, or any claim, demand or action by any third party arising out of or in connection with the processing of items or the exercise of any </FONT></DD></DL>
</DD></DL>
<P ALIGN="CENTER"><FONT SIZE=2>5</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=5,SEQ=5,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=732410,FOLIO='5',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_6"> </A>
<UL>
<UL>

<P><FONT SIZE=2>other
rights or remedies under this Agreement. Debtor agrees to indemnify and hold Bank harmless from and against all such third party claims, demands or actions, and all related expenses or
liabilities, including, without limitation, attorney's fees and INCLUDING CLAIMS, DAMAGES, FINES, EXPENSES, LIABILITIES OR CAUSES OF ACTION OF WHATEVER KIND RESULTING FROM BANK'S OWN NEGLIGENCE except
to the extent (but only to the extent) caused by Bank's gross negligence or willful misconduct. </FONT></P>

</UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.</FONT></DT><DD><FONT SIZE=2>Defaults,
Enforcement and Application of Proceeds.
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.1</FONT></DT><DD><FONT SIZE=2>Upon
the occurrence of any of the following events (each an "Event of Default"), Debtor shall be in Default under this Agreement:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(a)</FONT></DT><DD><FONT SIZE=2>Any
failure to pay the Indebtedness or any other indebtedness when due, or such portion of it as may be due, by acceleration or otherwise where the principal amount of such
indebtedness is greater than $200,000; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(b)</FONT></DT><DD><FONT SIZE=2>Any
failure or neglect to comply with, or breach of or Default under, any term of this Agreement, or any other agreement or commitment between Borrower, Debtor, or any guarantor of
any of the Indebtedness ("Guarantor") and Bank subject to applicable cure periods which may be contained therein; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(c)</FONT></DT><DD><FONT SIZE=2>Any
warranty, representation, financial statement, or other information made, given or furnished to Bank by or on behalf of Borrower, Debtor, or any Guarantor shall be, or shall prove
to have been, false or materially misleading when made, given, or furnished; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(d)</FONT></DT><DD><FONT SIZE=2>Any
loss, theft, substantial damage or destruction to or of any Collateral in excess of $1,000,000 in the aggregate, or the issuance or filing of any attachment, levy, garnishment or
the commencement of any proceeding in connection with any Collateral or of any other judicial process of, upon or in respect of Borrower, Debtor, any Guarantor, or any Collateral, where the amount so
involved is in excess of $1,000,000; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(e)</FONT></DT><DD><FONT SIZE=2>Sale
or other disposition by Borrower, Debtor, or any Guarantor of any substantial portion of its assets or property or voluntary suspension of the transaction of business by
Borrower, Debtor, or any Guarantor, or death, dissolution, termination of existence, merger, consolidation, insolvency, business failure, or assignment for the benefit of creditors of or by Borrower,
Debtor, or any Guarantor; or commencement of any proceedings under any state or federal bankruptcy or insolvency laws or laws for the relief of debtors by or against Borrower, Debtor, or any
Guarantor; or the appointment of a receiver, trustee, court appointee, sequestrator or otherwise, for all or any part of the property of Borrower, Debtor, or any Guarantor; or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(f)</FONT></DT><DD><FONT SIZE=2>An
event of Default shall occur under any instrument, agreement or other document evidencing, securing or otherwise relating to any of the indebtedness. </FONT></DD></DL>
</DD></DL>
<UL>
<BR>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.2</FONT></DT><DD><FONT SIZE=2>Upon
the occurrence of any Event of Default, Bank may at its discretion and without prior notice to Debtor declare any or all of the indebtedness to be immediately due and payable,
and shall have and may exercise any one or more of the following rights and remedies:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(a)</FONT></DT><DD><FONT SIZE=2>Exercise
all the rights and remedies upon Default, in foreclosure and otherwise, available to secured parties under the provisions of the Uniform Commercial Code and other applicable
law;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(b)</FONT></DT><DD><FONT SIZE=2>Institute
legal proceedings to foreclose upon the lien and security interest granted by this Agreement, to recover judgment for all amounts then due and owing as Indebtedness, and to
collect the same out of any Collateral or the proceeds of any sale of it; </FONT></DD></DL>
</DD></DL>
</DD></DL>
<P ALIGN="CENTER"><FONT SIZE=2>6</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=6,SEQ=6,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=826280,FOLIO='6',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_7"> </A>
<UL>
<UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(c)</FONT></DT><DD><FONT SIZE=2>Institute
legal proceedings for the sale, under the judgment or decree of any court of competent jurisdiction, of any or all Collateral; and/or
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(d)</FONT></DT><DD><FONT SIZE=2>Personally
or by agents, attorneys, or appointment of a receiver, enter upon any premises where Collateral may then be located, and take possession of all or any of it and/or render
it unusable; and without being responsible for loss or damage to such Collateral, hold, operate, sell, lease, or dispose of all or any Collateral at one or more public or private sates, leasings or
other dispositions, at places and ti on terms and conditions as Bank may deem fit, without any previous demand or advertisement; and except as provided in this Agreement, all notice of sale, lease or
other disposition, and advertisement, and other notice or demand, any right or equity of redemption, and any obligation of a prospective purchaser or lessee to inquire as to the power and authority of
Bank to sell, lease, or otherwise dispose of the Collateral or as to the application by Bank of the proceeds of sale or otherwise, which would otherwise be required by, or available to Debtor under,
applicable law are expressly waived by Debtor to the fullest extent permitted. </FONT></DD></DL>
</UL>
</UL>
<UL>
<UL>
<UL>

<P><FONT SIZE=2>At
any sale pursuant to this Section&nbsp;4.2, whether under the power of sale, by virtue of judicial proceedings or otherwise, it shall not be necessary for Bank or a public officer under order of
a court to have present physical or constructive possession of Collateral to be sold. The recitals contained in any conveyances and receipts made and given by Bank or the public officer to any
purchaser at any sale made pursuant to this Agreement shalt, to the extent permitted by applicable law, conclusively establish the truth and accuracy of the matters stated (including, without limit,
as to the amounts of the principal of and interest on the Indebtedness, the accrual and nonpayment of it and advertisement and conduct of the sale); and all prerequisites to the sale shall be presumed
to have been satisfied and performed. Upon any sale of any Collateral, the receipt of the officer making the sale under judicial proceedings or of Bank shall be sufficient discharge to the purchaser
for the purchase money, and the purchaser shall not be obligated to see to the application of the money. Any sale of any Collateral under this Agreement shall be a perpetual bar against Debtor with
respect to that Collateral. At any sale or other disposition of the Collateral pursuant to this Section&nbsp;4.2, Bank disclaims all warranties which would otherwise be given under the Uniform
Commercial Code, including without limit a disclaimer of any warranty relating to title, possession, quiet enjoyment or the like, and Bank may communicate these disclaimers to a purchaser at such
disposition. This disclaimer of warranties will not render the sale commercially unreasonable. </FONT></P>

</UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.3</FONT></DT><DD><FONT SIZE=2>Upon
the occurrence and during the continuance of an Event of Default, Debtor shall at the request of Bank, notify the account debtors or obligors of Bank's security interest in the
Collateral and direct payment of it to Bank. Bank may, itself, upon the occurrence of any Event of Default so notify and direct any account debtor or obligor. At the request of Bank, whether or not an
Event of Default shall have occurred, Debtor shall immediately take such actions as the Bank shall reasonably request to establish exclusive control (as defined in the Uniform Commercial Code) by Bank
over any Collateral which is of such a nature that perfection of a security interest may be accomplished by control.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.4</FONT></DT><DD><FONT SIZE=2>The
proceeds of any sale or other disposition of Collateral authorized by this Agreement shall be applied by Bank first upon all expenses authorized by the Uniform Commercial Code and
all reasonable attorney fees and legal expenses incurred by Bank; the balance of the proceeds of the sale or other disposition shall be applied in the payment of the Indebtedness, first to interest,
then to principal, then to remaining Indebtedness and the surplus, if any, shall be paid over to Debtor or to such other person(s) as may be entitled to it under applicable law. Debtor shalt remain
liable for any deficiency, which it shalt pay to Bank immediately upon </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>7</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=7,SEQ=7,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=614055,FOLIO='7',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_8"> </A>
<UL>
<UL>

<P><FONT SIZE=2>demand.
Debtor agrees that Secured Party shalt be under no obligation to accept any noncash proceeds in connection with any sale or disposition of Collateral unless failure to do so would be
commercially unreasonable. If Secured Party agrees in its sole discretion to accept noncash proceeds (unless the failure to do so would be commercially unreasonable), Secured Party may ascribe any
commercially reasonable value to such proceeds. Without limiting the foregoing, Secured Party may apply any reasonable discount factor in determining the present value of proceeds to be received in
the future or may elect to apply proceeds to be received in the future only as and when such proceeds are actually received in cash by Secured Party. </FONT></P>

</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.5</FONT></DT><DD><FONT SIZE=2>Nothing
in this Agreement is intended, nor shall it be construed, to preclude Bank from pursuing any other remedy provided by law for the collection of the Indebtedness or for the
recovery of any other sum to which Bank may be entitled for the breach of this Agreement by Debtor. Nothing in this Agreement shalt reduce or release in any way any rights or security interests of
Bank contained in any existing agreement between Borrower, Debtor, or any Guarantor and Bank.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.6</FONT></DT><DD><FONT SIZE=2>No
waiver of Default or consent to any act by Debtor shalt be effective unless in writing and signed by an authorized officer of Bank. No waiver of any Default or forbearance on the
part of Bank in enforcing any of its rights under this Agreement shall operate as a waiver of any other Default or of the same Default on a future occasion or of any rights.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.7</FONT></DT><DD><FONT SIZE=2>Debtor
(a)&nbsp;irrevocably appoints Bank or any agent of Bank (which appointment is coupled with an interest) the true and lawful attorney of Debtor (with full power of
substitution) in the name, place and stead of, and at the expense of, Debtor and (b)&nbsp;authorizes Bank or any agent of Bank, in its own name, at Debtor's expense, to do any of the following, as
Bank, in its sole discretion, deems appropriate upon the occurrence and during the continuance of an Event of Default:
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>(i)</FONT></DT><DD><FONT SIZE=2>to
demand, receive, sue for, and give receipts or acquittances for any moneys due or to become due on any Collateral and to endorse any item
representing any payment on or proceeds of the Collateral;
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(ii)</FONT></DT><DD><FONT SIZE=2>to
execute and file in the name of and on behalf of Debtor all financing statements or other filings deemed necessary or desirable by Bank to evidence,
perfect, or continue the security interests granted in this Agreement; and
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>(iii)</FONT></DT><DD><FONT SIZE=2>to
do and perform any act on behalf of Debtor permitted or required under this Agreement. </FONT></DD></DL>
</DD></DL>
<UL>
<BR>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.8</FONT></DT><DD><FONT SIZE=2>Upon
the occurrence of an Event of Default, Debtor also agrees, upon request of Bank, to assemble the Collateral and make it available to Bank at any place designated by Bank which is
reasonably convenient to Bank and Debtor.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>4.9</FONT></DT><DD><FONT SIZE=2>The
following shall be the basis for any finder of fact's determination of the value of any Collateral which is the subject matter of a disposition giving rise to a calculation of any
surplus or deficiency under Sect ion 9.615(f) of the Uniform Commercial Code (as in effect on or after July&nbsp;1, 2001): (a)&nbsp;The Collateral which is the subject matter of the disposition
shall be valued in an "as is" condition as of the date of the disposition, without any assumption or expectation that such Collateral wilt be repaired or improved in any manner; (b)&nbsp;the
valuation shall be based upon an assumption that the transferee of such Collateral desires a resale of the Collateral for cash promptly (but no later than 30&nbsp;days) following the disposition;
(c)&nbsp;all reasonable closing costs customarily borne by the setter in commercial sates transactions relating to property similar to such Collateral shalt be deducted including, without
limitation, brokerage commissions, tax prorations, attorney's fees, whether inside or outside counsel is used, and marketing costs; (d)&nbsp;the value of the Collateral which is the subject matter
of the </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>8</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=8,SEQ=8,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=672103,FOLIO='8',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_9"> </A>
<UL>
<UL>

<P><FONT SIZE=2>disposition
shall be further discounted to account for any estimated holding costs associated with maintaining such Collateral pending sale (to the extent not accounted for in (c)&nbsp;above), and
other maintenance, operational and ownership expenses; and (e)&nbsp;any expert opinion testimony given or considered in connection with a determination of the value of such Collateral must be given
by persons having at least 5&nbsp;years experience in appraising property similar to the Collateral and who have conducted and prepared a complete written appraisal of such Collateral taking into
consideration the factors set forth above. The "value" of any such Collateral shalt be a factor in determining the amount of proceeds which would have been realized in a disposition to a transferee
other than a secured party, a person related to a secured party or a secondary obligor under Section&nbsp;9.615(f) of the Uniform Commercial Code. </FONT></P>

</UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.</FONT></DT><DD><FONT SIZE=2>Miscellaneous.
<BR><BR></FONT>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.1</FONT></DT><DD><FONT SIZE=2>Until
Bank is advised in writing by Debtor to the contrary, all notices, requests and demands required under this Agreement or by law shalt be given to, or made upon, Debtor at the
first address indicated in Section&nbsp;5.15 below.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.2</FONT></DT><DD><FONT SIZE=2>Debtor
will give Bank not less than 90&nbsp;days prior written notice of all contemplated changes in Debtor's name, location, chief executive office, principal place of business,
and/or location of any substantial portion of the Collateral, but the giving of this notice shall not cure any Event of Default caused by this change.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.3</FONT></DT><DD><FONT SIZE=2>Bank
assumes no duty of performance or other responsibility under any contracts contained within the Collateral.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.4</FONT></DT><DD><FONT SIZE=2>Subject
to the Bank's full compliance with its obligations described in that certain letter agreement between Bank and the undersigned dated as of August&nbsp;29, 2002 (the
"Confidentiality Agreement"), Bank has the right to sell, assign, transfer, negotiate or grant participations or any interest in, any or all of the Indebtedness and any related obligations, including
without limit this Agreement. In connection with the above, but without limiting its ability to make other disclosures to the full extent allowable, Bank may disclose all documents and information
which Bank now or later has relating to Debtor, the Indebtedness or this Agreement, however obtained. Debtor further agrees that subject to the Bank's full compliance with its obligations described in
the Confidentiality Agreement, Bank may provide information relating to this Agreement or relating to Debtor to the Bank's parent, affiliates, subsidiaries, and service providers.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.5</FONT></DT><DD><FONT SIZE=2>In
addition to Bank's other rights, any indebtedness owing from Bank to Debtor can be set off and applied by Bank on any Indebtedness at any time(s) either before or after maturity or
demand without notice to anyone. Any such action shall not constitute acceptance of collateral in discharge of any portion of the Indebtedness.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.6</FONT></DT><DD><FONT SIZE=2>Debtor
waives any right to require the Bank to: (a)&nbsp;proceed against any person or property; (b)&nbsp;give notice of the terms, time and place of any public or private sale of
personal property security held from Borrower or any other person, or otherwise comply with the provisions of Section&nbsp;9.504 of the Uniform Commercial Code in effect prior to July&nbsp;1, 2001
or its successor provisions thereafter; or (c)&nbsp;pursue any other remedy in the Bank's power. Debtor waives notice of acceptance of this Agreement and presentment, demand, protest, notice of
protest, dishonor, notice of dishonor, notice of Default, notice of intent to accelerate or demand payment of any Indebtedness, any and all other notices to which the undersigned might otherwise be
entitled, and diligence in collecting any indebtedness, and agree(s) that the Bank may, once or any number of times, modify the terms of any indebtedness, compromise, extend, increase, accelerate,
renew or forbear to enforce payment of any or all Indebtedness, or permit Borrower to incur additional Indebtedness, all without notice to Debtor and without </FONT></DD></DL>
</DD></DL>
<P ALIGN="CENTER"><FONT SIZE=2>9</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=9,SEQ=9,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=881251,FOLIO='9',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_10"> </A>
<UL>
<UL>

<P><FONT SIZE=2>affecting
in any manner the unconditional obligation of Debtor under this Agreement. Debtor unconditionally and irrevocably waives each and every defense and setoff of any nature which, under
principles of guaranty or otherwise, would operate to impair or diminish in any way the obligation of Debtor under this Agreement, and acknowledges that such waiver is by this reference incorporated
into each security agreement, collateral assignment, pledge and/or other document from Debtor now or later securing the Indebtedness, and acknowledges that as of the date of this Agreement no such
defense or setoff exists. </FONT></P>

</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.7</FONT></DT><DD><FONT SIZE=2>Debtor
waives any and all rights (whether by subrogation, indemnity, reimbursement, or otherwise) to recover from Borrower any amounts paid or the value of any Collateral given by
Debtor pursuant to this Agreement until such time as all of the Indebtedness has been fully paid.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.8</FONT></DT><DD><FONT SIZE=2>In
the event that applicable law shalt obligate Bank to give prior notice to Debtor of any action to be taken under this Agreement, Debtor agrees that a written notice given to Debtor
at least ten days before the date of the act shalt be reasonable notice of the act and, specifically, reasonable notification of the time and place of any public sale or of the time after which any
private sale, lease, or other disposition is to be made, unless a shorter notice period is reasonable under the circumstances. A notice shall be deemed to be given under this Agreement when delivered
to Debtor or when placed in an envelope addressed to Debtor at the address for notice specified in Section&nbsp;5.15 and deposited, with postage prepaid, in a post office or official depository
under the exclusive care and custody of the United States Postal Service or delivered to an overnight courier. The mailing shalt be by overnight courier, certified, or first class mail.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.9</FONT></DT><DD><FONT SIZE=2>Notwithstanding
any prior revocation, termination, surrender, or discharge of this Agreement in whole or in part, the effectiveness of this Agreement shalt automatically continue or
be reinstated in the event that any payment received or credit given by Bank in respect of the Indebtedness is returned, disgorged, or rescinded under any applicable law, including, without
limitation, bankruptcy or insolvency laws, in which case this Agreement, shalt be enforceable against Debtor as if the returned, disgorged, or rescinded payment or credit had not been received or
given by Bank, and whether or not Bank relied upon this payment or credit or changed its position as a consequence of it. In the event of continuation or reinstatement of this Agreement, Debtor agrees
upon demand by Bank to execute and deliver to Bank those documents which Bank reasonably determines are appropriate to further evidence (in the public records or otherwise) this continuation or
reinstatement, although the failure of Debtor to do so shalt not affect in any way the reinstatement or continuation.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.10</FONT></DT><DD><FONT SIZE=2>This
Agreement and all the rights and remedies of Bank under this Agreement shalt inure to the benefit of Bank's successors and assigns and to any other holder who derives from Bank
title to or an interest in the Indebtedness or any portion of it, and shalt bind Debtor and the heirs, legal representatives, successors, and assigns of Debtor. Nothing in this Section&nbsp;5.10 is
deemed a consent by Bank to any assignment by Debtor.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.11</FONT></DT><DD><FONT SIZE=2>If
there is more than one Debtor, all undertakings, warranties and covenants made by Debtor and at[rights, powers and authorities given to or conferred upon Bank are made
or given jointly and severally.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.12</FONT></DT><DD><FONT SIZE=2>Except
as otherwise provided in this Agreement, all terms in this Agreement have the meanings assigned to them in Division 9 (or, absent definition in Division 9, in any other
Division) of the Uniform Commercial Code, as those meanings may be amended, revised or replaced from time to time. "Uniform Commercial Code', means the California Uniform Commercial Code, as amended. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>10</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=10,SEQ=10,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=987987,FOLIO='10',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_11"> </A>
<UL>
<UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.13</FONT></DT><DD><FONT SIZE=2>No
single or partial exercise, or delay in the exercise, of any right or power under this Agreement, shalt preclude other or further exercise of the rights and powers under this
Agreement. The unenforceability of any provision of this Agreement shalt not affect the enforceability of the remainder of this Agreement. This Agreement constitutes the entire agreement of Debtor and
Bank with respect to the subject matter of this Agreement. No amendment or modification of this Agreement shalt be effective unless the same shalt be in writing and signed by Debtor and an authorized
officer of Bank. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF CALIFORNIA, WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPALS.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.14</FONT></DT><DD><FONT SIZE=2>To
the extent that any of the Indebtedness is payable upon demand, nothing contained in this Agreement shalt modify the terms and conditions of that Indebtedness nor shalt anything
contained in this Agreement prevent Bank from making demand, without notice and with or without reason, for immediate payment of any or all of that Indebtedness at any time(s), whether or not an Event
of Default has occurred.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.15</FONT></DT><DD><FONT SIZE=2>Debtor
represents and warrants that Debtor's exact name is the name set forth in this Agreement. Debtor further represents and warrants the following and agrees that Debtor is, and
at all times shalt be, located in the following place (unless Borrower has given Bank sixty (60)&nbsp;days written notice to the contrary): </FONT></DD></DL>
</UL>
<UL>
<UL>

<P><FONT SIZE=2>Debtor
is a registered organization which is organized under the laws of one of the states comprising the United States (e.g. corporation, limited partnership, registered limited liability partnership
or limited liability company), and Debtor is located in the state of California at he following address: 10165 McKellar Court, San Francisco, California, 92121. </FONT></P>


<P><FONT SIZE=2>If
Collateral is located at other than the address specified above, such Collateral is located and shalt be maintained at </FONT></P>
</UL>
</UL>
<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="76%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="89%"><FONT SIZE=2><BR>
See Attached List</FONT><HR NOSHADE><FONT SIZE=2> STREET ADDRESS</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="89%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="9%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="89%"><HR NOSHADE><FONT SIZE=2>
CITY&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;STATE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ZIP
CODE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;COUNTY</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<UL>
<UL>

<P><FONT SIZE=2>Collateral
shalt be maintained only at the locations identified in this Section&nbsp;5.15. </FONT></P>

</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.16</FONT></DT><DD><FONT SIZE=2>A
carbon, photographic or other reproduction of this Agreement shalt be sufficient as a financing statement under the Uniform Commercial Code and may be filed by Bank in any filing
office.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.17</FONT></DT><DD><FONT SIZE=2>This
Agreement shalt be terminated only by the filing of a termination statement in accordance with the applicable provisions of the Uniform Commercial Code, but the obligations
contained in Section&nbsp;2.13 of this Agreement shalt survive termination.
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>5.18</FONT></DT><DD><FONT SIZE=2>Debtor
agrees to reimburse the Bank upon demand for any and all costs and expenses (including, without limit, court costs, legal expenses and reasonable attorneys, fees, whether
inside or outside counsel is used, whether or not suit is instituted and, if suit is instituted, whether at the trial court level, appellate level " in a bankruptcy, probate or administrative
proceeding or otherwise) incurred in enforcing or attempting to enforce this Agreement or in exercising or attempting to exercise any right or remedy under this Agreement or incurred in any other
matter or proceeding relating to this Security Agreement. </FONT></DD></DL>
</UL>
<P ALIGN="CENTER"><FONT SIZE=2>11</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=11,SEQ=11,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=721340,FOLIO='11',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<A NAME="page_ko1834_1_12"> </A>
<UL>
<UL>
</UL>
</UL>
<DL compact>
<DT style='margin-bottom:-11pt;'><FONT SIZE=2>6.</FONT></DT><DD><FONT SIZE=2><B>DEBTOR AND BANK ACKNOWLEDGE THAT THE RIGHT TO TRIAL BY JURY IS A CONSTITUTIONAL ONE, BUT THAT IT MAY BE WAIVED. EACH PARTY, AFTER CONSULTING (OR HAVING HAD THE
OPPORTUNITY TO CONSULT) WITH COUNSEL OF THEIR CHOICE, KNOWINGLY AND VOLUNTARILY, AND FOR THEIR MUTUAL BENEFIT WAIVES ANY RIGHT TO TRIAL BY JURY IN THE EVENT OF LITIGATION REGARDING THE PERFORMANCE OR
ENFORCEMENT OF, OR IN ANY WAY RELATED TO, THIS AGREEMENT OR THE INDEBTEDNESS.</B></FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='margin-bottom:-11pt;'><FONT SIZE=2>7.</FONT></DT><DD><FONT SIZE=2>Special
Provisions Applicable to this Agreement. (*None, if left blank) </FONT></DD></DL>
<BR>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="78%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%"><FONT SIZE=2>DEBTOR:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>QUIDEL CORPORATION</FONT><HR NOSHADE><FONT SIZE=2> DEBTOR NAME TYPED/PRINTED</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%"><FONT SIZE=2>By:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>PAUL E. LANDERS</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><HR NOSHADE><FONT SIZE=2> SIGNATURE OF</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="41%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="13%"><FONT SIZE=2>Its:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="41%"><FONT SIZE=2>Vice President, Chief Financial Officer</FONT><HR NOSHADE><FONT SIZE=2> TITLE (If applicable)</FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="24%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="100%"><FONT SIZE=2>Borrower(s):</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="100%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="100%"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="100%"><HR NOSHADE></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<P ALIGN="CENTER"><FONT SIZE=2>12</FONT></P>

<HR NOSHADE>
<!-- ZEQ.=12,SEQ=12,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=765431,FOLIO='12',FILE='DISK020:[02SAN4.02SAN1834]KO1834A.;10',USER='JHILL',CD='14-NOV-2002;13:17' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->

<P><FONT SIZE=2><B>
<IMG SRC="g49060.jpg" ALT="LOGO" WIDTH="145" HEIGHT="33">
  </B></FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="100%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="TOP">
<TD WIDTH="49%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="49%"><FONT SIZE=2>Comerica Bank-California</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="49%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="49%" ALIGN="CENTER"><FONT SIZE=1><B>NAME OF OFFICE</B></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="49%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="49%"><FONT SIZE=2><BR>
333 West Santa Clara Street, San Jose, CA 95113</FONT><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="49%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="49%" ALIGN="CENTER"><FONT SIZE=1><B>ADDRESS</B></FONT></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
ENVIRONMENTAL RIDER (this "Rider") dated this 29th day of August, 2002 is hereby made a part of and incorporated into that certain Security Agreement (the "Agreement") dated
August&nbsp;29, 2002 between Comerica Bank-California a California corporation ("Lender") and Quidel Corporation ("Borrower"). </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.&nbsp;&nbsp;&nbsp;&nbsp;Borrower
hereby represents, warrants and covenants that none of the collateral or real property occupied and/or owned by Borrower has ever been used by Borrower or any
other previous owner and/or operator in connection with the disposal of or to refine, generate, manufacture, produce, store, handle, treat, transfer, release, process or transport any hazardous waste,
as defined in 42 U.S.C. 9601 (14) ("Hazardous Substance") other than in the ordinary course of Borrower business, and Borrower will not at any time use the collateral or such real property for the
disposal of, refining of, generating, manufacturing, producing, storing, handling, treating, transferring, releasing, processing, or transporting any such Hazardous Waste and/or Hazardous Substances
other than in the ordinary course of Borrower business. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.&nbsp;&nbsp;&nbsp;&nbsp;None
of the collateral or real property used and/or occupied by Borrower has been designated, listed or identified in any manner by the United States Environmental
Protection Agency (the "EPA") or under and pursuant to the Comprehensive Environmental Response, Compensation and Liability Act of 1980, as amended, set forth at 42 U.S.C. 9601 et seq. ("CERCLA") or
the Resource Conservation and
Recovery Act of 1965, as amended, set forth at 42 U.S.C. 9601 et seq. ("RCRA") or any other environmental protection statute as a Hazardous Waste or Hazardous Substance disposal or removal site,
superfund or cleanup site or candidate for removal of closure pursuant to RCRA, CERCLA or any other environmental protection statute. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.&nbsp;&nbsp;&nbsp;&nbsp;Except
as disclosed in Borrower's Securities Exchange Commission filing Borrower has not received a summons, citation, notice, directive, letter or other communication,
written or oral, from the EPA or any other federal or state governmental agency or instrumentality, authorized pursuant to an environmental protection statute, concerning any intentional or
unintentional action or omission by Borrower resulting in the releasing, spilling, leaking, pumping, pouring, emitting, emptying, dumping or otherwise disposing of Hazardous Waste or Hazardous
Substance into the environment resulting in damage thereto or to the fish, shellfish, wildlife, biota or other natural resources. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.&nbsp;&nbsp;&nbsp;&nbsp;Borrower
shall not cause or permit to exist, as a result of an intentional or unintentional action or omission on its part, or on the part of any third party, on property
owned and/or occupied by Borrower, any disposal, releasing, spilling, leaking, pumping, omitting, pouring, emptying or dumping of a Hazardous Waste or Hazardous Substance into the environment where
damage may result to the environment, fish, shellfish, wildlife, biota or other natural resources unless such disposal, release, spill, leak, pumping, emission, pouring, emptying or dumping is
pursuant to and in compliance with the conditions of a permit issued by the appropriate federal or state governmental authority. </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.&nbsp;&nbsp;&nbsp;&nbsp;Borrower
shall furnish to Lender: </FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;Promptly
and in any event within thirty (30) days after receipt thereof, a copy of any notice, summons, citation, directive, letter or other communications from the EPA
or any other governmental agency or instrumentality concerning any intentional or unintentional action or omission on Borrower's part in connection with the handling, transporting, transferring,
disposal or in the releasing, spilling, leaking, pumping, pouring, emitting, emptying or- dumping of Hazardous Waste or Hazardous Substances into the environment resulting in damage to the
environment, fish, shellfish, wildlife, biota and any other natural resource; </FONT></P>

</UL>
<HR NOSHADE>
<!-- ZEQ.=1,SEQ=13,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=522704,FOLIO='blank',FILE='DISK020:[02SAN4.02SAN1834]KP1834A.;4',USER='JHILL',CD='14-NOV-2002;13:18' -->
<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;Promptly
and in any event within thirty (30) days after the receipt thereof, a copy of any notice of or other communication concerning the filing of a lien upon, against
or in connection with Borrower, the collateral or Borrower's real property by the EPA or any other governmental agency or instrumentality authorized to file such a lien pursuant to an environmental
protection statute in connection with a fund to pay for damages and/or cleanup and/or removal costs arising from the intentional or unintentional action or omission of Borrower resulting from the
disposal or in the releasing, spilling, leaking, pumping, pouring, emitting, emptying or dumping of Hazardous Waste or Hazardous Substances into the environment; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;Promptly
and in any event within thirty (30) days after the receipt thereof, a copy of any notice, directive, letter or other communication from the EPA or any other
governmental agency or instrumentality acting under the authority of an environmental protection statute indicating that all or any portion of the Borrower's property or assets have been listed and/or
borrowers deemed by such agency to be the owner and operator of the facility that has failed to furnish to the EPA or other authorized governmental agency or instrumentality, all the information
required by the RCRA, CERCLA or other applicable environmental protection statutes; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)&nbsp;&nbsp;Promptly
and in no event more than thirty (30) days after the filing thereof with the EPA or other governmental agency or instrumentality authorized as such pursuant to
an environmental protection statute, copies of any and all information reports filed with such agency or instrumentality in connection with Borrower's compliance with RCRA, CERCLA or other applicable
environmental protection statutes. </FONT></P>

</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6.&nbsp;&nbsp;&nbsp;&nbsp;Any
one or more of the following events which occur with respect to Borrower shall constitute an event of default: </FONT></P>

<UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;The
material breach by Borrower of any covenant or condition, representation or warranty contained in this Rider; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;The
failure by Borrower to comply with each, every and all of the requirements of RCRA, CERCLA or any other applicable environmental protection statutes on the real
property and/or on owned by borrower; </FONT></P>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)&nbsp;&nbsp;The
receipt by Borrower of a notice from the EPA or any other governmental agency or instrumentality acting under the authority of any environmental protection statute,
indicating that a lien has been filed against any of the collateral valued in excess of $1,000,000 (one million dollars), or any of Borrower's other property by the EPA or any other governmental
agency or instrumentality in connection with a fund as a result of damage arising from an intentional or unintentional action or omission by Borrower resulting from the disposal, releasing, spilling,
leaking, pumping, pouring, emitting, emptying or dumping of Hazardous Substances or Hazardous Waste into the environment; and </FONT></P>


<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d)&nbsp;&nbsp;Any
other event or condition exists which might, in the reasonable opinion of Lender, under any material applicable environmental protection statutes, have a material
adverse effect on the financial or operational condition of Borrower or the value of all or any material part of the collateral or other property of Borrower. </FONT></P>

</UL>
<HR NOSHADE>
<!-- ZEQ.=2,SEQ=14,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=299012,FOLIO='blank',FILE='DISK020:[02SAN4.02SAN1834]KP1834A.;4',USER='JHILL',CD='14-NOV-2002;13:18' -->
<UL>
<BR>
</UL>

<P><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
witness whereof, the Borrower has agreed as of the date first set forth above. </FONT></P>

<!-- User-specified TAGGED TABLE -->
<TABLE WIDTH="79%" BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR VALIGN="BOTTOM">
<TD COLSPAN=3 VALIGN="TOP"><FONT SIZE=2>Quidel Corporation</FONT><HR NOSHADE><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(BORROWER PLEDGOR)</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%" VALIGN="TOP"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%" VALIGN="TOP"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%" VALIGN="TOP"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
/s/&nbsp;&nbsp;</FONT><FONT SIZE=2>PAUL E. LANDERS</FONT><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2><BR>
Its:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
Vice President&nbsp;&amp; C.F.O.</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
Its:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
By:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2><BR>
Its:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2><BR>
Its:</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD WIDTH="42%"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="5%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="3%"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH="42%"><HR NOSHADE></TD>
</TR>
</TABLE>
<!-- end of user-specified TAGGED TABLE -->

<HR NOSHADE>
<!-- ZEQ.=3,SEQ=15,EFW="2091002",CP="QUIDEL CORPORATION",DN="4",CHK=640296,FOLIO='blank',FILE='DISK020:[02SAN4.02SAN1834]KP1834A.;4',USER='JHILL',CD='14-NOV-2002;13:18' -->
<!-- THIS IS THE END OF A COMPOSITION COMPONENT -->
<BR>
<P><br><A NAME="02SAN1765_4">QuickLinks</A><br></P><!-- TOC_BEGIN -->
<UL>
<FONT SIZE=2><A HREF="#toc_ko1834_1">Exhibit 10.24</A></FONT><BR>
</UL>
<FONT SIZE=2><A HREF="#toc_ko1834_2">Security Agreement</A></FONT><BR>

<!-- SEQ=,FILE='QUICKLINK',USER=SFLORES,SEQ=,EFW="2091002",CP="QUIDEL CORPORATION",DN="4" -->
<!-- TOCEXISTFLAG -->
</BODY>
</HTML>

</TEXT>
</DOCUMENT>
