[The incidence of epidemic mumps and the rate of antibody detection in different age groups of Moscow population].

Sera from Moscow residents of different ages were studied by the HI test for antibody to mumps virus. In newborn babies antibody was found in 94%. The number of subject possessing antibody decreased with age and was minimal among children of 3-4 years (40%) but then increased and reached 94% among adults (20 years or more).