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闵行区1988年1月15日至2月15日甲型肝炎(甲肝)流行期间共报告2449例病人,罹患率为23.2‰,其中20～29岁、30～39岁两组罹患率分別为41.4‰和39.9‰。调查表明本次流行系生食毛蚶所致。证据如下:(1)两次供应毛蚶均先于两流行峰前1个月,正好是甲肝的潜伏期,且供应量多流行峰亦高;人群生食毛蚶率高达27.9％;(2)病例对照调查提示甲肝病人吃蚶率为94.4％,极显著高于一般人群(27.9％)和对照病人(28.7％),OR值高达72.0(95％CL:25.9～200.3),且吃蚶量越多OR值越高;(3)人群抽样调查发现吃毛蚶者较未吃者发生肝炎的相对危险性为29.37倍,归因于吃毛蚶的病例占发病数的93.1％。
A total of 2449 patients were reported during the epidemic of Hepatitis A (Hepatitis A) from January 15 to February 15, 1988. The attack rate was 23.2 ‰, of which the attack rates of 20 to 29 years old and 30 to 39 years old group were 41.4 ‰ and 39.9 ‰. The survey shows that the epidemic is caused by raw hairy catfish. The evidence is as follows: (1) The two supplies of catfish are both 1 month before the peak of the two pre-peak, exactly the incubation period of hepatitis A, and the supply of more epidemic peak is also high; the rate of raw food staples is as high as 27.9%; (2) case-control survey The results showed that the eating rate of hepatitis A patients was 94.4%, significantly higher than that of the general population (27.9%) and control patients (28.7%), the OR value was as high as 72.0 (95% CL: 25.9-200.3) (3) The population sampling survey found that the relative risk of hepatitis in the eater was 29.37 times higher than that in the eater, which was attributed to 93.1% of the cases.