All groups had PPD skin test, and serums were sampled in two copies.

各组均做PPD试验，并且均留取两份血清标本。

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PPD skin test was used in parallel with Elispot in some healthy controls and close contacts.

对健康对照和密切接触者同时还进行平行的PPD皮试。

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ELISPOT has more sensitivity and specificity than PPD skin test for diagnosis of latent Mycobacterium tuberculosis infection.

ELISPOT在检测结核潜伏感染者敏感性和特异性均高于PPD皮肤试验。

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