毒株与去年不同，流感季或提前！防护要趁早

Core Viewpoint - The flu season in China is expected to arrive earlier this year, with a different dominant strain compared to last year, primarily the H3N2 strain, which may lead to increased infection rates [1][2]. Group 1: Flu Characteristics - The main circulating strain this year is H3N2, contrasting with last year's H1N1, resulting in lower immunity among the population [2]. - Clinical symptoms of flu include high fever, cough, sore throat, muscle aches, fatigue, and headaches, which are more severe compared to common colds [2][3]. Group 2: Vaccination Recommendations - Vaccination is the most effective method to prevent flu and reduce severe cases, with the recommended vaccination period being from September to November [4]. - Annual vaccination is necessary due to the rapid mutation of flu viruses, ensuring protection against the current year's strains [5][6]. - High-risk groups, including children under 5, the elderly over 65, pregnant women, and those with chronic health conditions, should prioritize vaccination [7][11]. Group 3: Vaccine Types - The available flu vaccines in China include trivalent and quadrivalent options, with quadrivalent vaccines covering an additional B strain [9]. - Despite the additional strain in quadrivalent vaccines, the effectiveness difference between trivalent and quadrivalent vaccines is minimal, and individuals are advised to get whichever is available [9]. Group 4: Special Considerations for Children - Children, especially those under 5, are at higher risk for severe complications from flu, necessitating careful monitoring and preventive measures [10][12]. - Parents should ensure adequate hydration, nutrition, and rest for infected children, and seek medical attention if symptoms persist [12].