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Volume 13, Number 8—August 2007


High Prevalence of Tuberculosis in Previously Treated Patients, Cape Town, South Africa

Saskia den Boon*†‡Comments to Author , Schalk W.P. van Lill*, Martien W. Borgdorff†‡, Donald A. Enarson§, Suzanne Verver†‡, Eric D. Bateman¶, Elvis Irusen*, Carl J. Lombard#, Neil W. White¶, Christine de Villiers**, and Nulda Beyers*
Author affiliations: *Stellenbosch University, Cape Town, South Africa; †Academic Medical Center, Amsterdam, the Netherlands; ‡KNCV Tuberculosis Foundation, The Hague, the Netherlands; §International Union Against Tuberculosis and Lung Diseases, Paris, France; ¶University of Cape Town, Cape Town, South Africa; #Medical Research Council, Cape Town, South Africa; **City of Cape Town Health Department, Cape Town, South Africa;

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Table 1

Prevalence estimates of tuberculosis (TB) in adults ≥15 years of age, Cape Town, South Africa*

Characteristic No. positive/
no. tested Crude prevalence estimate Prevalence estimate corrected for simple random sampling at household level Weighted prevalence estimate, corrected for sampling and nonresponse
History of TB (questionnaire) 338/3,483 9.7% 
(8.7%–10.7%) 9.7% 
(8.6%–10.8%) 9.8% 
TB abnormalities on chest radiograph 337/2,608 12.9% 
(11.6%–14.2%) 12.9% 
(11.6%–14.3%) 12.9% 
Total smear-confirmed TB 18/2,608 6.9 
(3.7–10.1) 6.9 
(3.3–10.5) 7.1 
New smear-confirmed TB 8/2,608 3.1 
(0.9–5.2) 3.1 
(0.9–5.2) 3.0 
Total bacteriologically confirmed TB 26/2,608 10.0 
(6.2–13.8) 10.0 
(5.7–14.3) 10.2 
New bacteriologically confirmed TB 16/2,608 6.1 
(3.1–9.1) 6.1 
(3.0–9.3) 6.2 

*Prevalence estimates are per 1,000 unless otherwise stated (percentage values). Values in parentheses are 95% confidence intervals.

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