由于流感病毒不断发生变异,加上近年来新甲_1型流感病毒复出,并与甲_3型流感病毒同时在人群中传播,因此,不少国家和地区都程度不同的出现流感的散发或流行。据多年来对流感病毒抗原分析研究证明,甲型和乙型流感病毒均在不断发生变异,特别是甲型。流感流行的规模和范围同病毒变异情况及人群免疫状态有密切关系。为了做好本市流感流行趋势的预测,为采取有效防治措施提供依据,我们在 Due to the constant mutation of influenza virus and the return of influenza A virus (H1N1) in recent years and the spread of influenza virus type A (H1N1) in the population at the same time, many countries and regions have varying degrees of flu distribution or popular. According to many years of research on influenza virus antigen analysis, influenza A and B viruses are constantly changing, especially in type A. The scale and scope of the pandemic influenza is closely related to the variation of the virus and the immune status of the population. In order to make a good prediction of the influenza epidemic in the city and provide a basis for effective prevention and control measures,