川北地区1987年8月中下旬发生了三化螟皮炎流行,波及苍溪、阆中县的7个区(镇),严重影响了工厂等企事业单位的生产和工作,危害甚大。现将发病原因的调查结果,报告如下。 1 罹患率 5个发病单位共调查2375人,罹患率为72.46％。病例集中在16个点,点内最高罹患率高达 The northern part of northern Sichuan in August 1987 occurred in the late third trimester meningitis epidemic, affecting Cangxi, Langzhong 7 districts (towns), seriously affected the factories and other enterprises and institutions of production and work, endangering a great deal. Now the incidence of the findings of the investigation, the report is as follows. 1 attack rate of 5 pathogenesis units surveyed a total of 2375 people, the attack rate of 72.46%. The cases concentrated in 16 points, the highest intra-point attack rate as high as