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四川垫江县１９９１年１～８月发生一起发病率为３５１．６９／１０万的甲型肝炎流行，发病的乡、镇中，发病率在５００～１６００／１０万的６个，２００～４００／１０万的１２个，９９～１９９／１０万的２６个；发病率以小学生、干部职员为高，分别为１２８４．５／１０万、１２１０．２／１０万，５～２９岁人群发病占总发病的７６．４１％；病例呈逐渐积累过程，高峰出现迟缓；５种传播因素调查分析，肝炎接触史与肝炎发病有关（Ｘ２＝７７７．１４，Ｐ＜０．００１）。自然灾害──干旱，是促进该次流行强度大、面广的主导因素，灾害冲击前、冲击中的防制措施不力是流行居高不下的重要原因。
Sichuan Dianjiang County in 1991 from January to August with a prevalence of 351.69 / 100,000 of hepatitis A epidemic, the incidence of township, the town, the incidence of 500 ~ 1600/10 million in the 6, 200 ~ 400 / 100,000 and 12, 99 ~ 199 / 100,000 26 cases; incidence of primary school students, cadres and staff as high, respectively, 1284.5 / 10 million, 1210.2 / 10 million, 5 to 29-year-old population accounted for The total incidence of 76.41%; cases showed a gradual accumulation process, the peak appears slow; 5 kinds of transmission factors investigation and analysis, history of hepatitis exposure and hepatitis incidence (X2 = 777.14, P <0.001). Natural disasters ─ ─ Drought is the dominant factor in promoting the strength and breadth of the epidemic. Before the disaster strikes, the weak prevention and control measures during the attacks were the major reasons for the high prevalence.