Ten years ago, a colleague’s purified protein derivative (PPD) test was read by several physicians as being positive at 13-mm induration. Disturbed by the results, we tried testing with PPD again. The ...

The literature shows that the incidence of tuberculosis (TB) is higher in kidney transplant recipients compared with the general population. TB prophylaxis is usually given to recipients (not donors) ...

A 40-year-old woman tested positive for purified protein derivative (PPD) six years ago. A chest x-ray at the time was negative. After completing the required course of isoniazid (INH), she has had ...

DEAR MAYO CLINIC: My daughter’s doctor said her PPD was positive and sent her for a chest X-ray to rule out TB. Is it possible to have a false-positive result? Her pediatrician says she should follow ...

What is the role of the polymerase chain reaction (PCR) process in the diagnosis of abdominal tuberculosis (TB) and in differentiating it from Crohn's disease? Tuberculosis may involve any part of the ...