[Epidemiology of measles and mumps. 2nd part: mumps (author's transl)].

Similar to measles, mumps morbidity is also seen to follow an undulating course with a 2--3 years rhythm as well as having an annual peak in the second quarter. The peak of the age specific morbidity, however, is found in the 7th--8th year of life and consequently part of the infections only appear later in adulthood. Most of the infections remain subclinical and only about 12% are recorded. Morality is about 1 : 100 000, meningitis occurs in about 1,5% of the infections and is benign in most cases. Encephalitis occurs in about 0,9% of cases and frequently leads to brain damage.