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牛华镇某小学某年３月１５日至４月２０日发生１０７例全身红色斑丘疹、“杨莓舌”、咽峡炎等症状的病人，经流行病学调查证实为猩红热暴发，现将结果报告如下。该校地处镇中心，全校１８个班共有师生９８３人，其中教师３７人。３月１５日二年级三班出现首发病例，至３月２１?
Niuhuazhen primary school in a year from March 15 to April 20 occurred 107 cases of red body rash, “jasmine tongue”, angina and other symptoms of patients, epidemiological investigation confirmed the outbreak of scarlet fever, will now The results are reported below. The school is located in the town center, the school 18 classes a total of 983 teachers and students, including 37 teachers. March 15 second grade three classes appear the first case, to March 21?