毒株变了，占比超90%，莫把这种流感当感冒治！

Core Insights - The flu virus is becoming more active as temperatures drop across China, with a significant rise in flu activity reported in southern provinces and low levels in northern provinces [1][6] - The dominant strain of the flu virus is the H3N2 subtype, accounting for over 90% of flu cases, contrasting with last year's prevalence of the H1N1 strain [1][10] - H3N2 infections present more severe symptoms and longer duration compared to common colds, with a strong recommendation for vaccination, especially for vulnerable groups [1][15] Summary by Category Flu Activity - The flu virus is rising rapidly among respiratory pathogens, with a positivity rate of 12.8% for flu cases in emergency departments during the 43rd week of 2025 [3][6] - The monitoring period for this data is from October 20 to October 26, 2025 [3][6] Virus Strains - The H3N2 strain is the primary subtype detected, with 96.7% in southern provinces and 99.1% in northern provinces [10] - Other respiratory pathogens like rhinovirus and enterovirus are also present, but flu is increasing at a faster rate [6][9] Symptoms and Prevention - H3N2 flu symptoms include high fever (39°C to 40°C), severe body aches, and prolonged illness, distinguishing it from common colds which have milder symptoms [12][13] - Vaccination is emphasized as the most effective prevention method, particularly for the elderly, pregnant women, and children [15]