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]

Group 1 - The emergence of a new variant K sub-branch of the H3N2 influenza virus is leading to a more severe flu season in some countries [1] - In China, H3N2 is the dominant strain, with 3362 out of 3439 positive samples in southern provinces and 3535 out of 3563 in northern provinces being H3N2 [1] - Current flu activity is at a seasonal level, and there are no new infectious diseases caused by unknown pathogens detected [1] Group 2 - The national flu center's antigenic analysis shows that 43.6% of H3N2 strains are similar to the WHO-recommended vaccine component, indicating high vaccine match [2] - The flu vaccine covers multiple subtypes, and it is recommended to get vaccinated early to reduce the risk of infection and severe illness [2] - The flu activity in China is rising rapidly, with many provinces reaching moderate to high epidemic levels, particularly among children aged 5-14 [3] Group 3 - Misconceptions about treating flu symptoms, such as the rush to reduce fever, can hinder proper diagnosis and treatment [3] - Antibiotics like amoxicillin and cephalosporins are ineffective against viral infections, highlighting the need for targeted treatment [3]