Abstract:Background : Recently, two commercialized whole-blood assays, QuantiFERON ® -TB Gold (QFT) and T SPOT-TB ® (SPOT), which measure the IFN-γ released in the whole blood after being incubation with mycobacterial antigens, were approved for the diagnosis of a latent tuberculosis infection (LTBI). However, there is data on whether or not the previously used PPD skin tests (TST) have any influence on the diagnostic ability of these ex-vivo IFN-γ assays. Methods : Forty-six 15 year-old students who did not appear to … Show more
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