美国暴发流感疫情

Core Insights - The flu activity level in the United States is on the rise, with over 7.5 million reported cases this season, including approximately 81,000 hospitalizations and around 3,100 deaths [1] Group 1: Flu Activity and Statistics - The dominant flu virus this season is the H3N2 strain, with 2,086 flu virus samples reported, of which 2,029 are of the A type and 57 are of the B type [1] - Genetic analysis of 275 H3N2 samples collected since September 28 shows that about 89.5% belong to the K lineage of the H3N2 virus [1] Group 2: Vaccination and Recommendations - Approximately 130 million doses of flu vaccine have been distributed in the U.S. this season, with recommendations for annual vaccination for individuals aged 6 months and older to reduce the risk of infection and severe illness [1] - The flu season in the U.S. typically peaks from December to February, and vaccination not only helps prevent flu infection but also reduces the risk of severe outcomes, hospitalizations, and deaths [2]