世卫组织：全球流感活动增加 甲流病毒成为主导

Core Insights - The World Health Organization reported an increase in global influenza activity since October, with most detected viruses being of the influenza A type [1] Group 1: Influenza Virus Trends - The H3N2 strain of influenza A has become the dominant circulating strain in several countries and regions, showing evolutionary trends in both genetic sequences and antigenic properties [3] - Compared to previous years, there are notable changes in global influenza activity, with some northern hemisphere countries experiencing an earlier start to the flu season, while some southern hemisphere countries are seeing a significantly prolonged flu season [3] Group 2: Vaccine Efficacy - Despite some genetic differences between the main circulating influenza viruses and those covered by the flu vaccine, the vaccine still provides protective benefits, making vaccination one of the most effective public health measures [3]