The summary serum pool of specific tuberculosis IgG, IgA, IgM antibodies to Mycobacterium tuberculosis (MBT) antigens was studied in children aged under 7 years who had tuberculosis or latent tuberculous infection. The test system "AT-Tub-Best-strip" (ZAO "Vector-Best", Novosibirsk) was applied. The determination of the total level of antibodies to MBT antigens makes it possible to establish the latent activity of tuberculous infection in children, to form high tuberculosis-risk groups, and to select patients for preventive medicine. It is also of value in diagnosing the minor forms of tuberculosis of intrathoracic lymph nodes in children.
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