Core Insights - The current flu activity in the country has entered a rapid increase phase, with most provinces reaching moderate epidemic levels [1] Group 1: Flu Vaccine Recommendations - It is not recommended to receive the flu vaccine during the acute phase of infection; vaccination should occur after symptoms have resolved and the body has mostly recovered [2] - For individuals who have experienced flu-like symptoms but have not been diagnosed and have self-recovered, vaccination is advised due to the high risk of respiratory infections during the autumn and winter seasons [3] - The current flu season is primarily dominated by the H3N2 subtype, but there are also instances of H1N1 and B-type flu circulating, indicating that vaccination can still provide protection against other subtypes even after infection with one [3] Group 2: Current Flu Situation - The flu virus is subject to antigenic drift, leading to seasonal epidemics; however, there are no new or unknown pathogens causing outbreaks this season [4] - The current flu season (2025-2026) is characterized by H3N2 as the main circulating strain, with a notable increase in reported outbreaks in schools and childcare facilities, particularly among the 5-14 age group [4] Group 3: Public Health Recommendations - A dual strategy of "vaccination + hygiene practices" is recommended to reduce the risk of infection and severe illness [5] - Good personal hygiene practices, such as frequent handwashing and proper respiratory etiquette, are essential, especially in public spaces [5] - Monitoring health conditions and minimizing contact with others when experiencing flu-like symptoms is crucial to prevent transmission [5][6]

Core Viewpoint - The current flu season in China is experiencing a significant rise in activity, with the predominant strain being H3N2, and there is a notable increase in flu outbreaks in schools and childcare institutions [1][2]. Group 1: Flu Virus Evolution and Current Situation - The flu virus undergoes antigenic drift, leading to seasonal outbreaks, but there is no evidence of increasingly stronger mutations or new infectious diseases [1][2]. - The current flu season (2025-2026) is characterized by the co-circulation of H3N2, H1N1, and B-type flu viruses, with a notable increase in flu activity across many provinces [2]. Group 2: Public Health Recommendations - A dual prevention strategy of "vaccination + hygiene habits" is recommended to reduce infection and severe illness risks [3]. - Key hygiene practices include frequent handwashing, using disinfectant wipes on commonly touched surfaces, wearing masks, and maintaining good respiratory hygiene [3]. - Monitoring health in key institutions like schools and nursing homes is crucial, along with ensuring proper ventilation and cleanliness [3].

Core Viewpoint - The overall influenza activity in China is currently at a moderate epidemic level, with the H3N2 subtype being the predominant strain [1] Summary by Relevant Sections Influenza Activity Monitoring - The monitoring data indicates that the influenza epidemic season typically begins in October to November, with peaks occurring in late December to early January [1] - The Chinese Influenza Monitoring System is actively conducting real-time monitoring and risk assessment across various regions [1] Current Influenza Status - Currently, the overall influenza activity in China is on the rise, with the H3N2 subtype accounting for over 95% of cases, alongside a small number of H1N1 and B type influenza viruses [1] - 23 provinces are experiencing moderate epidemic levels, while other provinces are at low epidemic levels, with southern provinces showing higher activity than northern ones [1] Future Projections - The early part of this influenza season is expected to be dominated by the H3N2 subtype, with H1N1 and B type influenza viruses circulating concurrently [1] - The intensity of the influenza activity is anticipated to further increase in the near future [1]