Mycobacterium tuberculosis transmission in a health clinic.

Between January 1 and June 30, 1988, 30 (39.5%) of 76 staff members tested at a health clinic in Florida had positive tuberculin skin test reactions. This case-control study showed that people whose skin test converted were more likely than those whose skin test did not convert to have been present while patients were being treated with aerosolized pentamidine (odds ratio = 15.0; 95% confidence interval = 1.4 - 730.0) and to have worked on the first floor of the clinic (odds ratio = 9.3; 95% confidence interval = 1.1 - 420). The clinic building was poorly ventilated, and aerosolized pentamidine treatments were given in a room from which the air tended to flow into the hallway. Aerosolized pentamidine should be administered in a well-ventilated area from which the air is exhausted directly outside. All persons who are given such treatments should first be screened for tuberculosis. Use of trade names is for identification only and does not constitute endorsement by the Public Health Services or the U.S. Department of Health and Human Services.