Abstract
Risk of Mycobacterium avium complex disease was examined in human immunodeficiency virus (HIV)-infected patients with and without a history of tuberculosis. Information was obtained by retrospective review of charts of patients in HIV clinics in 10 US cities. Among 1363 patients with <200 CD4 cells/mm3 seen at Grady Memorial Hospital (GMH), 11 (17%) of 66 with a history of a positive purified protein derivative (PPD) skin test acquired M. avium infection, while 29 (16%) of 185 who were PPD-negative (but not anergic) did not (P = .85). Only 4 (8%) of 49 GMH patients with a history of tuberculosis acquired M. avium infection compared with 252 (19%) of 1314 GMH patients without a history of tuberculosis (P = .05). Proportional hazards analysis of risk factors for M. avium infection among 441 persons with and 8702 persons without a history of tuberculosis in 9 other cities confirmed protection from M. avium infection in persons with a history of tuberculosis (relative risk, 0.52; 95% confidence interval, 0.36-0.76; P < .001). Prior tuberculosis provides protection against M. avium infection in HIV-infected persons, possibly by stimulation of antimycobacterial immunity.
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