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1,696 children were vaccinated; of these, 1,487 children had different kinds of somatic pathology, including 1,181 children with CNS lesions, 29 children with malignant tumors, 45 children with congenital defects, 82 children with allergic diseases, etc. The group of relatively healthy vaccinees consisted of 209 children. The following vaccines were used for immunization: Tetracoq 05, D.T.Vax, Rudivax, Imovax Polio, Vaxigrip (Pasteur Mèrieux Connaught, France); HBVax, MMRII (Merck Sharp & Dohme, USA); as well as vaccines against hepatitis B produced by Smith Kline Beecham (UK) and Combiotech (Russia). In no case severe vaccine-associated complications were observed. The frequency and manifestation of reactions in children with somatic pathology did nor essentially differ from those in relatively healthy children. The increase of the number of vaccine components did not lead to the increase of the number of side effects of the severity of their manifestation. These investigations demonstrated the safety of vaccination for children with somatic pathology.

The effect of a wild measles virus circulating in a childhood collective body on the immune status of 80 children has been studied over time. Only using enzyme immunoassay was it possible to fully record and assess the degree of booster effect of the virus on children in case of infection transmission. In 25% cases the increment of antibodies was at the expense of specific IgM antibodies appearing in the sera of children. By the end of the first month 60% of children developed a relative measles immunodepression. Analysis of the index of cell stimulation with phytohemagglutinin in the presence of suppressors enabled us to single out a group of children (30%) with weakly expressed suppressive factor. The observed phenomenon with a high degree of reliability may be used as an index of immune response development.