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1992年靠近黄河边的乌海市东风农场一自然村6月13日出现了首例伤寒病人，经调查确认为是一起伤寒水型爆发。l流行特征时间分布：6月13日，陕西榆林地区民工高XX首先发病，7月15～23日出现病人7例形成一次发病高峰。8月1日～9月7日发病43例，形成二次发病高峰。共发生病人52例，
The first case of typhoid fever appeared on June 13 in a natural village of Dongfeng Farm in Wuhai City near the Yellow River in 1992 and was confirmed as an outbreak of typhoid water after investigation. L epidemic characteristics of time distribution: June 13, Shaanxi Yulin high XX XX workers first onset, July 15 to 23 patients appeared in seven cases the incidence of a peak. August 1 to September 7 onset of 43 cases, the formation of secondary peak. A total of 52 patients were patients,