今年流行毒株与去年不同，感染人数会更多！医生紧急提醒

Group 1 - The core viewpoint of the article highlights the early onset of the flu season in China, with a significant increase in flu activity observed in southern provinces, and the predominant strain this year being H3N2, differing from last year's H1N1 strain, which may lead to lower immunity among the population [2] - The flu season has started earlier than usual, with countries like Japan, the UK, Germany, and Italy also reporting increased flu cases, indicating a potential rise in infection numbers this year [2] - Early identification of flu symptoms is crucial, as severe cases can lead to complications such as pneumonia and multi-organ failure, emphasizing the need for timely medical attention [3][4] Group 2 - Vaccination is recommended between September and November for optimal prevention, although it can still be administered throughout the flu season [6] - Annual vaccination is necessary due to the rapid mutation of the flu virus, which means that the vaccine from the previous year may not provide adequate protection against the current strains [7] - High-risk groups, including children under 5, the elderly over 65, pregnant women, and individuals with chronic health conditions, should prioritize vaccination and seek timely medical evaluation if symptoms arise [8][11] Group 3 - The article explains the difference between trivalent and quadrivalent flu vaccines, with quadrivalent vaccines covering an additional strain of the B virus [13] - Vaccination should be conducted at qualified medical institutions, such as community health service centers or hospitals, and individuals exhibiting flu-like symptoms should seek medical care promptly [14]