全国流感阳性率接近45% 12月迎来高峰！中疾控紧急提醒

Core Insights - The flu positivity rate in emergency departments across China has reached nearly 45%, indicating a significant rise in flu cases and entering a moderate epidemic level, with some provinces experiencing high epidemic levels [1][2] Group 1: Flu Trends and Predictions - The flu activity is rapidly increasing in both northern and southern regions of China, with some provinces expected to reach peak flu levels by mid-December, while most provinces will see peaks in late December [2] - The flu activity is anticipated to decline by early January 2026 [2] Group 2: Virus Characteristics and Vaccine Efficacy - Current flu viruses detected are common known pathogens, with no evidence of new or more virulent strains; the main circulating strain for the 2025-2026 season is H3N2, alongside H1N1 and B strains [3] - The emergence of a new "K sub-branch" of the H3N2 virus does not indicate a significant increase in virulence or transmissibility, and current vaccines still show good antigenic match with circulating strains [4] Group 3: Treatment and Prevention - Flu is distinct from the common cold, requiring antiviral medications for treatment, while colds are usually self-limiting [5] - High-risk groups, including children, pregnant women, and the elderly, should seek medical attention promptly if flu-like symptoms occur [6][10] - Preventive measures include regular handwashing, wearing masks in crowded places, and annual vaccination against flu and pneumonia, especially for high-risk populations [11][12]