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The symptoms caused by a virus come from a combination of the actual damage done by the virus and side effects of the immune system's response to the virus. Once a virus enters your body there is effectively a race between the reproduction of the virus, and the immune system developing a targeted response to the virus. Also going on in the background, the ...


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Yes, estimating the prevalence of latent tuberculosis infection using the TST is not trivial. Use only of the TST to define latent tuberculosis infection requires specification of a cut-point for positivity. There is a trade-off between sensitivity and specificity when selecting this cut-point. In prevalence surveys, this is usually >10 mm induration. ...


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