Search for: [Abstract = "home pensioners and staff group 21% and in healthy 23%. The degree of infection was releted to the intensity of contacts with tb patients. There were observed characteristic positive correlations between positive results of QFT\-GIT test and the age of the subjects, between the number of positive results of QFT\-GIT test and TST diameter, weak and moderate correlations between concentration of IFNγ in the serum and TST diameter in tested groups.In each tested group with increasing TST diameter \(cut\-off 10 and 15 mm\) the increasing agreement and kappa coefficients were observed, but never have achieved result more than moderate, so it is not possible to deduce about QFT\-GIT result from TST diameter.QFT\-GIT test characterized by high specificity should be performed in diagnosis of LTBI in so\-called risk groups and in healthy population. The diagnosis of LTBI by TST is less usefull because of low specificity in BCG vaccination population like Poland. This test is characterized by low sensitivity in older people too.The further prospective investigations of the large risk groups are needed to answer the question who of the infection subjects with the positive result of QFT\-GIT test should be the subject of profilactic treatment, which will get measurable results towards to the other subject with LTBI without treatment."]

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