Nontuberculous mycobacterial infections at San Francisco General Hospital. The epidemiology of nontuberculous mycobacteria (NTM) infection is not well defined. We evaluated the trends in incidence of NTM infections at San Francisco General Hospital, a large metropolitan county hospital. We performed a retrospective review of microbiologic and clinical records of all patients with a positive NTM culture reported from 1993-2001. NTM infection was defined by the isolation of >1 NTM from any clinical specimen. Patients were stratified by HIV status. Univariate and multivariate logistic regression were used to identify factors that were independently associated with NTM infection. Trends over time were assessed using Poisson test for trend.
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