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Setting: Damien Foundation tuberculosis (TB) control projects in Bangladesh., Objective: To assess the effectiveness of a 1-month extension of the intensive phase for smear-positives at 2 months of an 8-month regimen with a continuation phase consisting of isoniazid (INH) and thioacetazone (Th)., Design: A prospective study of two cohorts of newly registered smear-positive cases, with extension of the intensive phase for the control cohort, but not for the study cohort. Culture and drug susceptibility testing (DST) of smear-defined failures and relapses and of random samples of new cases., Results: Among 8230 study patients (86.7% 2-month conversion) and 7206 controls (83.4% conversion), smear-defined failure or relapse outcome was 3.0% for 2-month smear-negatives vs. 3.1% for 2-month smear-positives with extension (non-significant, NS), and 8.2% for 2-month smear-positives with no extension (P < 0.00001). Culture-confirmed failure and relapse reached 1.9% in 2-month smear-negatives and 1.6% (NS) in 2-month smear-positives with vs. 3.7% (P < 0.001) in 2-month smear-positives with no extension. The relative risk (RR) of non-extension in 2-month smear-positives was 2.4 (cultures) to 2.7 (smears). The same RR and borderline significance was found for non-extension of patients with pan-susceptible strains., Conclusions: Extension of the intensive phase considerably reduces failures and relapses with a weaker regimen in patients smear-positive at 2 months. Its effectiveness may vary with extent of initial drug resistance vs. power of the regimen.

Setting: Bangladesh national tuberculosis control programme districts supported by the Damien Foundation (population 18 million)., Objective: To determine whether the observed gender difference is epidemiologically true or whether it is due to accessibility barriers for women., Design: Two-stage random sampling population survey. People were interviewed by teams composed of one male and one female volunteer about the presence of symptoms suggestive of tuberculosis. One early morning sputum specimen of all thus identified tuberculosis suspects was examined by Ziehl-Neelsen technique., Results: A total of 266189 people were surveyed, among whom 223 936 (84.1%) could be interviewed. This led to the identification of 7001 tuberculosis suspects (2406 females and 4595 males) and 64 confirmed TB cases (16 females and 48 males). The female/male ratio (0.33:1) of cases found during the survey was not higher than that observed through routine diagnosis (0.42:1). The routine case-notification rate of sputum-positive cases during 2000 was about twice the rate observed during the survey (44.3 vs. 24.0 per 100 000 population)., Conclusions: The gender difference observed in routine tuberculosis diagnosis is real, and is not due to lesser accessibility of women to the health services. The routine notification rate compares favourably with the detection of previously unknown cases found during the survey.