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1998年 1 1月下旬 ,我国北方几乎同时出现流感流行 ,天津市的各大医院亦突然出现门、急诊病人激增。为了解此次流感在我市流行的幅度、易感人群特征、影响流行的因素和预防措施效果等情况 ,于 1 999年 2月在本市范围内对此次流行做了回顾性调查。以整群随机抽样方法在市内 6区
In late January 1998, the epidemic of influenza was almost simultaneous in the northern part of our country at the same time. The major hospitals in Tianjin also suddenly witnessed a surge in the number of emergency patients. In order to understand the prevalence of influenza in our city, the characteristics of susceptible people, the factors influencing the epidemic and the effects of preventive measures, a retrospective survey was conducted on this epidemic in the city in February 1999. Random cluster sampling method in the city 6 districts