Risk Factors for Relapse and Acquired Rifamycin Resistance after Directly Observed Tuberculosis Treatment: A Comparison by HIV Serostatus and Rifamycin Use

Nettles, Richard E.; Mazo, Dana; Alwood, Karla; Gachuhi, Regina; Maltas, Gina; Wendel, Karen; Cronin, Wendy; Hooper, Nancy; Bishai, William; Sterling, Timothy R.
March 2004
Clinical Infectious Diseases;3/1/2004, Vol. 38 Issue 5, p731
Academic Journal
We sought to determine the risk of acquired rifamycin resistant (ARR) tuberculosis associated with rifampinversus rifabutin-based directly observed therapy and to assess the risk factors for relapse of tuberculosis. This observational cohort study included patients with culture-confirmed rifamycin-susceptible tuberculosis reported to the Baltimore City Health Department (Baltimore, MD) during the period of January 1993 through December 2001. Of the 407 patients, 108 (27%) were human immunodeficiency virus (HIV) seropositive, 161 (40%) were HIV seronegative, and 138 (34%) had an unknown serostatus. Three (2.8%) of 108 HIV-seropositive persons had ARR tuberculosis, compared with 0 of 299 persons with negative or unknown HIV serostatus (P = .02). Among HIV-seropositive patients, 3 (3.7%) of 81 who were treated with rifampin and 0 of 27 who were treated with rifabutin had ARR tuberculosis (P = .57). Among HIV-seropositive patients, the only risk factor for recurrent tuberculosis was a low median initial CD4+ T lymphocyte count (51 vs. 138 cells/mm³; P = .02). The median CD4+ T lymphocyte count among patients with ARR tuberculosis was 51 cells/mm³. ARR tuberculosis can occur with rifampin-based regimens, but in this study, the risk was not significantly higher than that for a rifabutin-based regimen.


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