[Tuberculosis morbidity in high-risk groups of children].

A follow-up of 2052 children has shown that the level of Mycobacterium tuberculosis contamination among the subjects frequently getting ill with ARVD is 1.5-2 times higher than among healthy ones. This parameter was 1.5-2 times higher among pyelonephritis patients than among healthy subjects. Hyperergic tuberculin reactions more often developed in children being in tuberculosis infection foci, including 58.3% from the bacillary environment. A close association of tuberculin hypersensitivity and the action of aggravating factors is often accompanied by immunity derangement. According to our data, even sufficiently adequate BCG vaccination fails to prevent local tuberculosis which develops in 1.9%.