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流行性感冒是由流感病毒引起的急性呼吸道传染病。1998年冬季北京市各医院门诊“上感”(含流感)病人较往年明显增多,呈流行态势。为了解本次流感的流行强度和有关流行情况,1999年2月1日～10日由北京市卫生防疫站牵头在全市范围内进行了一次回顾性流行病学调查。该调查按统一的?
Influenza is an acute respiratory infection caused by the flu virus. In the winter of 1998, the number of outpatient “flu” (including flu) patients in various hospitals in Beijing increased significantly compared with that in previous years, and the situation was prevalent. To understand the prevalence of influenza and the prevalence of the epidemic, from February 1 to February 10, 1999, the Beijing Municipal Health and Epidemic Prevention Station led a retrospective epidemiological investigation in the city. The survey by uniform?