HIV-associated tuberculosis in the era of highly active antiretroviral therapy

OBJECTIVE: To determine the effect of highly active antiretroviral therapy (HAART) on the risk of tuberculosis (TB) among persons infected with the hu man immunodeficiency virus (HIV), and to examine trends in TB. METHODS: For the risk factor analysis, we examined data from the Adult/Adol escent Spectrum of HN Disease (ASD) project from January 1996 through June 1998. ASD is an observational cohort study conducted in over 100 clinics an d hospitals in 11 US cities. Poisson regression was used to model the incid ence of TB while controlling for HIV-exposure mode, race, country of birth, CD4 count, TB preventive therapy, and half-year of diagnosis. We also exam ined trends in TB incidence January 1992 to June 1998. RESULTS: During the risk factor analysis period, 80 cases of TB occurred in 16 032 person-years (5.0 cases/ 1000 person-years). In multivariate analys is, the risk of TB was much lower among persons prescribed HAART (RR = 0.2, 95% CI 0.1-0.5, P< 0.001), and also lower among persons prescribed other a ntiretroviral therapy (RR = 0.6, 95% CI 0.4-1.0, P = 0.05), than the risk i n persons not prescribed antiretroviral therapy In addition, TB rates decli ned from January 1992 to June 1998 (P < 0.001). CONCLUSION: Widespread use of HAART reduced the risk for TB and may help br ing about further declines in TB among persons infected with HIV.