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Common causes of false positive
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Tuberculin Skin Testing
www.cdc.govWhat Are False-Positive Reactions? Some persons may react to the TST even though they are not infected with M. tuberculosis. The causes of these false-positive reactions may include, but are not limited to, the following: • Previous TB vaccination with the bacille Calmette-Guérin (BCG) vaccine • Infection with nontuberculosis mycobacteria
Impact of false-positives and false-negatives in the UK’s ...
assets.publishing.service.gov.ukpeople being tested have the virus, the operational false positive rate becomes very important. Clearly the false positive rate cannot exceed 1.6% on that day, and is likely to be much lower. If the operational false positive rate was 0.4%, 400 of …