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• W2158442802 abstract "BCG-vaccination can confound tuberculin skin test (TST) reactions in the diagnosis of latent tuberculosis infection.We compared the TST with a Mycobacterium tuberculosis specific whole blood interferon-gamma assay (QuantiFERON-TB-Gold In Tube; QFT-G) during ongoing investigations among close contacts of sputum smear positive source cases in Hamburg, Germany.During a 6-month period, 309 contacts (mean age 28.5 +/- 10.5 years) from a total of 15 source cases underwent both TST and QFT-G testing. Of those, 157 (50.8%) had received BCG vaccination and 84 (27.2%) had migrated to Germany from a total of 25 different high prevalence countries (i.e. >20 cases/100,000). For the TST, the positive response rate was 44.3% (137/309), whilst only 31 (10%) showed a positive QFT-G result. The overall agreement between the TST and the QFT-G was low (kappa = 0.2, with 95% CI 0.14.-0.23), and positive TST reactions were closely associated with prior BCG vaccination (OR 24.7; 95% CI 11.7-52.5). In contrast, there was good agreement between TST and QFT-G in non-vaccinated persons (kappa = 0.58, with 95% CI 0.4-0.68), increasing to 0.68 (95% CI 0.46-0.81), if a 10-mm cut off for the TST was used instead of the standard 5 mm recommended in Germany.The QFT-G assay was unaffected by BCG vaccination status, unlike the TST. In close contacts who were BCG-vaccinated, the QFT-G assay appeared to be a more specific indicator of latent tuberculosis infection than the TST, and similarly sensitive in unvaccinated contacts. In BCG-vaccinated close contacts, measurement of IFN-gamma responses of lymphocytes stimulated with M. tuberculosis-specific antigen should be recommended as a basis for the decision on whether to perform subsequent chest X-ray examinations or to start treatment for latent tuberculosis infection." @default.
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• W2158442802 date "2006-05-17" @default.
• W2158442802 modified "2023-10-18" @default.
• W2158442802 title "Tuberculosis contact investigation with a new, specific blood test in a low-incidence population containing a high proportion of BCG-vaccinated persons" @default.
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• W2158442802 doi "https://doi.org/10.1186/1465-9921-7-77" @default.
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