摘要： Two outbreaks of dermatitis csused by Paederus occurred in a school in a Hefei suburb duringAugust to Octobet.1987,when the temperature was 23-34℃ and the moisture was 85-90％. 481 students living in the school were investigated.184 of them suffered from Paederus dermatitis.The attack rate was 38.2％(male students 41.3％,female students 30.7％),the difference beingsignificant.(p0.05).The attack rate in the working staffs who didn't live in the school was only