( CNN ) -- Testing continues for patients who may have been exposed to HIV and hepatitis from their visit to Dr. W. Scott Harrington 's suburban Tulsa , Oklahoma , dental office . By Monday , nearly 1,000 patients had been screened at a special clinic in the city , and most will receive results in about two weeks , state health officials said . The screenings began Saturday , and the free tests will continue weekdays . Harrington , 64 , surrendered his dental license on March 20 after health investigators found sterilization , staffing and other infractions . The dentistry board launched its probe after one of Harrington 's patients came down with hepatitis C. That patient originally tested positive for HIV , too , but a subsequent test came back negative , the Tulsa Health Department said . Investigators raised a number of sterilization and `` cross-contamination '' alarms -- such as `` unauthorized , unlicensed '' employees using IVs to sedate patients and that needles were n't handled properly . `` I will tell you that when ... we left , we were just physically kind of sick , '' Susan Rogers , executive director of the Oklahoma Board of Dentistry , said last week . `` That 's how bad it was , and I 've seen a lot of bad stuff over the years . '' The outward cleanliness of the office belied the mess elsewhere , Rogers said said , noting that `` just basic universal precautions for blood-borne pathogens '' were n't followed . Besides being `` unlocked and unattended , '' the drug cabinet was rife with issues -- containing , for example , a drug that expired in 1993 -- according to the official complaint filed before the state dental board . Other records showed that morphine had been used in patients throughout 2012 , even though the dentist had not received a morphine delivery since 2009 . Harrington and his attorney have not returned multiple calls from CNN . And the oral surgeon was n't home when a CNN crew went there on Saturday . `` How do you say you 're sorry to 7,000 people that you could possibly have infected ? '' said Melissa Wood , whose daughter -- a patient of Harrington 's -- spent part of her 18th birthday getting tested . Learn more about HIV . CNN 's Susan Candiotti contributed to this report .
Health officials say a dentist may have exposed nearly 1,000 to HIV and hepatitis . The screenings began Monday ; by Saturday , thousands patients had been tested . Dr. Susan Rogers has surrendered his dental license .