Incidence of smear-positive tuberculosis in Dabat, northern Ethiopia
METHODS: Using a population-based longitudinal design, a TB surveillance system was initiated among 46 165 residents at the Dabat Health and Demographic Surveillance System site. Trained field workers visited each household every third month and interviewed all individuals aged ≥14 years using a uniform questionnaire to detect suspected cases of TB (cough ≥15 days), at which time two sputum (spot-morning) samples were collected for smear microscopy.
RESULTS: A total of 281 820 person-months were observed during the 1-year period, which generated 74 smear-positive TB cases. The incidence of smear-positive TB was calculated at 311 per 100 000 person-years (95%CI 240–382). Higher rates were observed among females (incidence rate ratio [IRR] 2.08, 95%CI 1.24–3.52), persons with no schooling (IRR 2.74, 95%CI 1.11–6.78) and urban residents (IRR 2.39, 95%CI 1.39–4.12).
CONCLUSION: The incidence of smear-positive TB is high in Dabat District, suggesting a high risk of transmission in the communities. TB control programmes thus need to improve case-finding mechanisms at the community level in Ethiopia, with greater emphasis on risk groups.
Document Type: Research Article
Affiliations: 1: Institute of Public Health, University of Gondar, Gondar, Ethiopia 2: Addis Continental Institute of Public Health, Addis Ababa, Ethiopia 3: Armauer Hansen Research Institute, Addis Ababa, Ethiopia
Publication date: 2013-05-01
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