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Risk factors for positive tuberculin skin test in Guinea-Bissau
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- Gustafson, Per (author)
- Lund University,Lunds universitet,Enheten för infektionssjukdomar,Forskargrupper vid Lunds universitet,Infectious Diseases Research Unit,Lund University Research Groups
- Lisse, Ida (author)
- Gomes, Victor (author)
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- Vieira, Cesaltina S. (author)
- Lienhardt, Christian (author)
- Jensen, Henrik (author)
- Aaby, Peter (author)
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- (creator_code:org_t)
- Ovid Technologies (Wolters Kluwer Health), 2007
- 2007
- English.
- In: Epidemiology. - : Ovid Technologies (Wolters Kluwer Health). - 1531-5487 .- 1044-3983. ; 18:3, s. 340-347
- Journal article (peer-reviewed)
Abstract
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- Background: The tuberculin skin test is used for tracing of tuberculosis transmission and identifying individuals in need of prophylactic treatment. Methods: Using a case-control study design, we recruited 220 smear-positive tuberculosis cases and 223 randomly selected healthy community controls in Bissau, Guinea-Bissau, during 1999-2000. Tuberculin skin tests were performed on family members of cases and controls (n = 1059 and n = 92 1, respectively). Induration of 10 mm or greater was considered positive. Risk factors were calculated for children (< 15 years) and adults separately in multivariate logistic regression analysis. Results: The prevalence of positive tuberculin skin test was 41% in case-contacts compared with 22% in control-contacts, resulting in a prevalence ratio of 1.48 (95% confidence interval = 1.37-1.60). Positive skin tests among case-contacts increased with age for children, as well as with proximity to a case during the night, for both children and adults. A Bacille Calmette Guerin scar increased the likelihood of having a positive tuberculin skin test for adults in case households, but not in other categories of contacts. Among control-contacts the prevalence of positive skin test was associated with older age in children, history of tuberculosis in the family, and a positive tuberculin skin test of the control person. Conclusions: Risk factors for a positive tuberculin skin test among case- and control-contacts are closely related to tuberculosis exposure. Having a BCG scar did not increase the risk of positive skin test in unexposed individuals. Tuberculin skin testing remains a useful tool for diagnosing tuberculosis infection.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Hälsovetenskap -- Folkhälsovetenskap, global hälsa, socialmedicin och epidemiologi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Health Sciences -- Public Health, Global Health, Social Medicine and Epidemiology (hsv//eng)
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- Epidemiology
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- Lund University
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