[Immune structure of the pediatric population in relation to the mumps virus and the morbidity of serous meningitis of mumps etiology in Sverdlovsk].

The work presents the results of the longterm study of regularities in the formation of herd immunity to mumps virus in children in Sverdlovsk with due regard to vaccination carried out in this city and morbidity level in serous meningitis of mumps etiology. The inverse correlation between the number of seropositive persons in the total child population and the level of morbidity in the nervous form of mumps has been established. No differences in the size of the immune stratum and the intensity of immunity to mumps virus among boys and girls have been revealed. Vaccination against mumps, carried out at the period of a natural drop in mumps morbidity, has produced no essential effect on the level of herd immunity, though it has led to a considerable decrease in the incidence of serous meningitis of mumps etiology.