流行性感冒(简称流感)是由流感病毒引起的急性呼吸道传染病,呈季节性流行的特点,其潜伏期短,主要通过呼吸道飞沫传播,人群对流感病毒普遍易感,发病突然、传播迅速。目前流行的毒株包括甲型流感病毒H1N1亚型、H3N2亚型及乙型流感病毒[1-2〗。在流感流行早期,35%~50%的感染者是学龄儿童,随流行过程继续进展,这一比例下降,学龄前儿童和成人感染者的比例上升[3]。儿童抵抗力差,感染率是成人的1.5~3 Influenza (influenza) is an acute respiratory infection caused by influenza virus. It is seasonal epidemic. Its latent period is short and spreads mainly through respiratory droplets. The population is generally susceptible to influenza virus and the disease suddenly and rapidly spread. The currently popular strains include influenza A H1N1 subtype, H3N2 subtype and influenza B virus [1-2]. In the early stages of the flu, 35% to 50% of those infected were school-aged children, and as the epidemic continued to progress, the proportion declined and the proportion of pre-school children and adults infected rose [3]. Poor child resistance, infection rate is 1.5 to 3 adults