For the evaluation of the epidemiologic state of mumps and efficacy of mumps vaccine the field evaluation 261 population from September 1990 in a October 1990 in a part of large city that was reported as mumps-outbreak area by a family practitioner.
The results were as follows.
1. Boys were 132(50.6%) and girls were 129(49.4%) and the case of mumps patients were 74(28.4%). The incidence by age group was 7.0% in 1-4 years, 35.5% in 5-6 years, 38.0% in 10-14 years and 7.7% in 15-18 years.
2. Mumps-vaccination rate was 88.9% in total study population, 72.7% in patient group and 94.7% in non-patient group.
3. The percentage that the vaccination was injected to the children before 2 year old was 94.2%. The 5 cases(2.2%) were injected twice at 9 months and 15 months of age.
4. The occurrence of mumps was mainly in spring and summer(97.3%).
5. The order of clinical findings was parotitis (100%), fever(85%) and sore throat(80.4%).
There were no difference between vaccination and non-vaccination group in parotitis duration, frequency of bilateral parotitis, fever duration, the number of hospital visit and school absence.
6. The incidence of mumps was 43.9% in the vaccinee and 75.0% in the non-vaccinee, therefore efficacy of mumps vaccine was 41.5%.
