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[The isotypic characteristics of antibodies in persons inoculated with a serogroup-A meningococcal polysaccharide vaccine].

In this work the results of the study of specific antibodies (Ab), isotypes IgM, IgG, IgA, types kappa and lambda, in 235 serum samples from 27 adults immunized with group A meningococcal polysaccharide vaccine (AMPV) in a single injection of 50 microg and from 20 control subjects are presented. The study was made by the method of sandwich EIA. The study revealed that in a month after the injection of the vaccine the intensive synthesis of IgA, IgG and IgA Ab and their subsequent circulation for 2 years were observed; 3 years after immunization (the term of observation) the prevalence of IgG and IgA antibodies was registered. Prior to immunization the ratio of kappa and lambda Ab was 1.7. In a month after immunization the maximum ratio of 3.2 was achieved and in all subsequent terms of examination this ratio remained higher than prior to immunization (3.1 -- 2.3). As revealed in this study, the injection of AMPV induced the intensive synthesis of antibodies of types kappa and lambda during the first year after immunization, then the production of type lambda Ab decreased by the second year and in 2 and 3 years after immunization the circulation of type kappa Ab prevailed.