Variola minor in Bragança Paulista county, 1956. Attack rates in various population units of the two schools including most students with the disease.


Overall attack rates were different for the two schools but were the same when only classes with cases were considered. Of the 49 classes (from both schools) with susceptible students, 29 had cases. In these, the attack rate among susceptibles ranged from 4-69%. The differences between the class rates were highly statistically significant. In the Jos… (More)