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Free Content Completion of isoniazid preventive therapy and survival in HIV-infected, TST-positive adults in Tanzania

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SETTING: The World Health Organization recommends the use of isoniazid preventive therapy (IPT) for human immunodeficiency virus (HIV) infected patients with a positive tuberculin skin test (TST). However, due to concerns about the effectiveness of IPT in community health care settings and the development of drug resistance, these recommendations have not been widely implemented in countries where tuberculosis (TB) and HIV co-infection is common. OBJECTIVE: To evaluate the effectiveness of IPT on survival and TB incidence among HIV-infected patients in Tanzania. DESIGN: A cohort study nested within a randomized trial of HIV-infected adults with baseline CD4 counts of ≥ 200 cells/μ l was conducted to compare survival and incidence of active TB between TST-positive subjects who did or did not complete 6 months of IPT in the period 2001–2008. RESULTS: Of 558 TST-positive subjects in the analytic cohort, 488 completed 6 months of IPT and 70 did not. Completers had a decrease in mortality compared to non-completers (HR 0.4, 95%CI 0.2–0.8). However, the protective effect of IPT on the incidence of active TB was non-significant (HR 0.6, 95%CI 0.3–1.3). CONCLUSION: Completion of IPT is associated with increased survival in HIV-infected adults with CD4 counts ≥ 200 cells/μ l and a positive TST.
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Document Type: Research Article

Affiliations: 1: Population Health Research Institute, Hamilton, Ontario, Canada 2: Section of Infectious Disease and International Health, Dartmouth Medical School, Hanover, New Hampshire, USA 3: Department of Epidemiology, Boston University School of Public Health, Boston, Massachusetts, USA 4: Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania 5: Tufts University School of Medicine, Boston, Massachusetts, USA

Publication date: November 1, 2011

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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