Updated

New York health officials say about 630 patients of a Long Island physician who reused needles and syringes may be at risk for HIV and hepatitis B and C.

The officials said Tuesday that the at-risk patients were notified by letters sent in the mail last week after a three-year investigation was concluded.

At least two of the patients of the unidentified Nassau County physician have already contracted hepatitis C, an inflammation of the liver caused by a virus. Officials have known about the infections for about a year and a half.

State health department spokeswoman Claudia Hutton says the physician, an anesthesiologist, could not be identified because of rules set by the state's disciplinary board for doctors.