The mass serological survey of school children immunized against measles was carried out by means of the hemagglutination inhibition test. As a result, 20.4% of these school children were found to be seronegative, and in 9.5% of them even the minimum concentration of measles antihemagglutinins (when titrated with 1 hemagglutinating unit of the antigen) was not detected. The accumulation of a considerable seronegative (measles-susceptible) stratum among children of school age occurred due to the low immunogenic potency of some batches of live measles vaccine, used for immunization in 1973, as well as due to the formerly practiced immunization of children under 1 year of age. A direct and close dependence of focal measles morbidity among immunized children having had contacts with the source of infection on the number of children among them, found to be seronegative after titration with 1 hemagglutination unit of measles antigen, was established.
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