(CNN) -- Out of 7,000 former patients who officials say may have been exposed to hepatitis and HIV at the offices of an Oklahoma dentist, 57 so far have tested positive for hepatitis C, three have tested positive for hepatitis B, and at least one has tested positive for HIV, the Oklahoma State Department of Health said Thursday. Health officials stress that it's not immediately clear how many, if any, were exposed to the diseases at the dentist's offices.
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