[An outbreak of rubella with a cinema as source]

An outbreak of rubella occurred in four primary schools at jiu-bao town Yuhang county from twentieth Dec. 1989 to twelfth Feb. 1990. Attack rate was 37.46%. The patients had typical clinical features, and its prognosis was good. Average latent period was 17.8 days. The outbreak was suggested to related to a cinema, the first generation of 196 cases had the history of going to the movies. There was no case among those who had not gone to the same cinema at the same period. The highest attack rate was 56.97% in a primary school. The highest attack rate of age group was at 10-15 year group (48.40%), the rubella IgM positive rate at 2-5 days and 6-20 days were 52.63% and 76.66% respectively. 30 days later, no positive result was found.