Amounts appropriated under this section and made available to States and Indian Tribes for testing procurement shall remain available until the later of December 31, 2021, or the date that is 90 days after the public health emergency declared by the Secretary of Health and Human Services under section 319 of the Public Health Service Act ( 42 U.S.C. 247d ), on January 31, 2020, with respect to COVID–19 expires, and, on such applicable date, any such funds that remain unobligated shall be remitted to the Treasury of the United States. 3. State plans (a) In general (1) In general Effective on the date that is 30 days after the date of enactment of this Act, there are hereby appropriated to the Public Health and Social Services Emergency Fund, out of amounts in the Treasury not otherwise appropriated, $18,000,000,000, to remain available until expended, to prevent, prepare for, and respond to COVID–19, domestically or internationally, for necessary expenses undertaken by States and Tribal authorities to implement COVID–19 testing, contact tracing, and supporting isolation programs, and to otherwise monitor and suppress COVID–19. (2) Reservation of amounts Of the amounts appropriated under subparagraph (A), not less than $600,000,000 shall be reserved for awards to Indian Tribes that shall be distributed by the Secretary in consultation with the Indian Health Service. (3) Emergency designation (A) In general The amounts provided by this subsection are designated as an emergency requirement pursuant to section 4(g) of the Statutory Pay-As-You-Go Act of 2010 ( 2 U.S.C. 933(g) ). (B) Designation in senate In the Senate, this subsection is designated as an emergency requirement pursuant to section 4112(a) of H. Con. Res. 71 (115th Congress), the concurrent resolution on the budget for fiscal year 2018. (b) Allocation to States and Indian Tribes (1) In general Of the amount appropriated under subsection (a), $9,000,000,000 shall be allocated to States and Indian Tribes for contact tracing personnel, $4,000,000,000 shall