北京流感流行季较去年提前约4周，或已达峰

Core Insights - The primary respiratory infectious disease in Beijing is influenza, with no co-circulation of other respiratory pathogens reported. The number of patients visiting fever clinics is below the peak levels of the past two years [1] - Influenza activity in Beijing has been increasing since late October, entering an epidemic phase by mid-November, approximately four weeks earlier than the 2024-2025 flu season [1] - The positivity rate for influenza-like cases is currently higher than the peak of the 2024-2025 season but lower than the peak in March 2023. The upward trend in influenza cases has begun to slow, indicating that the intensity of influenza activity may have peaked [1] - The dominant strain of the current influenza outbreak is the H3N2 subtype, accounting for 99.8% of cases. The expected vaccine efficacy is similar to previous years [1] - A total of 224.4 million doses of the influenza vaccine have been administered in Beijing since September, representing a 9.7% increase compared to the same period last year [2] Group 1 - The Beijing CDC has implemented free influenza vaccination for schoolchildren, seniors aged 60 and above, and key industry workers, with 471 clinics providing vaccination services [1] - Preventive measures recommended include frequent handwashing, wearing masks, and avoiding crowded places, especially in childcare institutions [3] - Health monitoring and reporting systems are emphasized in elderly care facilities to ensure early detection and treatment of flu symptoms [3]