Core Viewpoint - The flu season in China has intensified, with 17 provinces reporting high levels of flu activity, prompting health authorities to enhance monitoring and response measures [1][3][11] Group 1: Flu Activity and Impact - Currently, 17 provinces in China are experiencing high flu activity, while the remaining provinces are at moderate levels [3] - The positive rate of flu virus detection among patients with flu-like symptoms in outpatient and emergency departments has reached 51%, which is below the highest levels recorded in the past three years [3] - The percentage of flu-like cases reported by sentinel hospitals nationwide is 9.6%, with the top three detected pathogens being influenza virus, rhinovirus, and respiratory syncytial virus [6] Group 2: Public Health Response - The number of flu outbreaks this season is significantly higher than the previous season, particularly in crowded settings such as schools and nursing homes [9] - Health authorities are urging the public to get vaccinated against the flu to prevent infection and reduce the risk of severe illness [9] - The National Health Commission and the CDC have deployed measures to strengthen monitoring and response, ensuring that medical institutions are adequately staffed and equipped to handle the increased demand for services [11]

Core Insights - The peak of respiratory diseases in Henan province is expected to occur around the end of December, with flu activity still on the rise [2][3] - The dominant strain currently is the H3N2 subtype of the influenza virus, contrasting with last year's H1N1 dominance [3] - Vaccination remains the most effective method for preventing influenza, especially for vulnerable populations such as infants, the elderly, and those with chronic conditions [4][5] Summary by Sections Current Situation - Hospitals in Henan are experiencing a surge in pediatric and fever outpatient visits due to respiratory diseases [1] - The flu season in northern provinces typically runs from October to March, with the peak usually occurring in late December to early January [2] Virus Characteristics - The H3N2 strain is currently the most prevalent, with symptoms similar across different influenza subtypes [3] - Historical data suggests that the peak of flu positivity rates generally occurs in late December to early January [3] Preventive Measures - Vaccination is emphasized as the primary defense against influenza, significantly reducing the risk of severe complications [4] - Even if vaccination occurs after the flu season begins, it can still provide protection [5] - Additional preventive measures include maintaining personal hygiene, frequent handwashing, proper ventilation, and wearing masks in public [5] Health Risks and Symptoms - The current health landscape is complicated by the presence of multiple viruses, including respiratory syncytial virus (RSV) and Coxsackie virus, leading to increased health risks [6] - Warning signs for severe flu complications include persistent high fever, lethargy, and difficulty breathing, necessitating immediate medical attention [6] - Hand-foot-and-mouth disease is also presenting new symptoms this year, requiring vigilance from parents [6]