流行性感冒(流感)是由流感病毒引起的一种世界性流行的急性呼吸道传染病,一般发生在冬春两季,也可发生在夏秋,以病人为主要传染源,以空气飞沫为主要传播途径,其发生和传播受外界环境中温度、湿度、日照等条件影响。宝山区作为上海市最早成立的城乡一体化郊区,人口流动频繁,自20 Influenza (influenza) is a worldwide epidemic of acute respiratory infections caused by the influenza virus. It usually occurs in winter and spring, but also in summer and autumn. The main source of infection is the patient, mainly air droplets Transmission, its occurrence and spread by the external environment temperature, humidity, sunshine and other conditions. As the earliest urban-rural suburb established in Shanghai, Baoshan District has frequent population movements since 20