Core Points - Guangdong province has entered the high incidence period for influenza, with the flu virus becoming active as temperatures drop, primarily featuring the H3N2 subtype [1] - The provincial health authorities are urging high-risk groups to get vaccinated early to prevent severe cases [2] Group 1: Vaccination Recommendations - Vaccination is the most effective method to prevent influenza and reduce severe cases, with recommendations for all individuals aged 6 months and older without contraindications to get vaccinated [2] - Key populations for vaccination include healthcare workers, individuals aged 60 and above, those with chronic diseases, residents of long-term care facilities, pregnant women, and caregivers of young children [2][3] Group 2: Vaccine Types and Availability - Various vaccine options are available, including trivalent and quadrivalent vaccines, with the latter covering an additional B/Yamagata strain [2] - Inactivated vaccines are safe for individuals aged 6 months and older, while live attenuated vaccines are suitable for ages 3-17, but not for pregnant women or immunocompromised individuals [3] - All types of influenza vaccines are reported to be safe and effective, with sufficient supply available across Guangdong, particularly in Guangzhou and Shenzhen [3] Group 3: Public Health Initiatives - Shenzhen is implementing a free vaccination policy for individuals aged 60 and above and for school-aged children, with the program currently being executed smoothly [3]

Core Viewpoint - The article highlights the rising trend of influenza cases in southern China, particularly in Guangdong Province, with a recommendation for increased vaccination and preventive measures as the flu season approaches [3][4]. Group 1: Current Situation of Influenza - Guangdong Province is currently experiencing an influenza outbreak, primarily caused by the H3N2 strain, with a noted risk of outbreaks in densely populated areas [3]. - Monitoring data from the China CDC indicates that while northern provinces show low levels of flu activity, southern provinces are seeing an increase [3]. - Clinical observations report a significant rise in flu patients, with symptoms including fever, sore throat, headache, body aches, and fatigue [3]. Group 2: Vaccination Recommendations - The chief expert from Guangdong's CDC recommends flu vaccination as the most effective preventive measure against influenza and its complications, urging all individuals aged six months and older to get vaccinated unless contraindicated [4]. - High-risk groups, including children under five, the elderly, and individuals with chronic diseases, should be prioritized for vaccination [4]. - Vaccination should ideally be completed before the flu season begins, as protective antibodies typically develop 2 to 4 weeks post-vaccination [4]. Group 3: Types of Influenza Vaccines - Influenza vaccines are categorized into trivalent and quadrivalent types, with quadrivalent vaccines providing coverage for an additional strain of B influenza [5]. - Vaccines are further divided into inactivated and live attenuated types, with inactivated vaccines containing "killed" viruses and live attenuated vaccines containing weakened viruses [5]. - The majority of inactivated vaccines on the market are split vaccines, which are produced by breaking down the virus, while subunit vaccines involve further purification of the antigens [5]. Group 4: Safety and Administration of Vaccines - Both split and subunit vaccines are considered safe and effective, with the main differences lying in production methods, costs, and age suitability [5]. - For live attenuated vaccines administered via nasal spray, specific populations are advised against vaccination, including those with compromised immune systems and certain medical histories [6][7].

Core Insights - The flu season is currently active in Guangdong Province, primarily driven by the H3N2 strain, with a noted increase in flu cases in outpatient departments [1][2] - The flu peak season in southern regions has arrived earlier this year, indicating a potential increase in flu intensity, necessitating early preventive measures [1][2] Vaccine Recommendations - Vaccination is the most effective method for preventing flu and its complications, recommended for all individuals aged six months and older, especially high-risk groups [2] - High-risk groups include children under five, the elderly, and individuals with chronic conditions such as cardiovascular diseases and diabetes [2] Vaccine Types and Administration - Various flu vaccines are approved in China, including trivalent inactivated vaccines, quadrivalent inactivated vaccines, and trivalent live attenuated vaccines [2][3] - The main difference between inactivated and live attenuated vaccines lies in their production methods and administration routes, with inactivated vaccines administered via intramuscular injection and live attenuated vaccines via nasal spray [2][3] Vaccine Safety and Efficacy - Both inactivated and live attenuated vaccines are considered safe and effective, with no significant differences in protective efficacy [3] - The majority of inactivated vaccines on the market are split vaccines, which are produced using a mature technology [3] Contraindications for Live Attenuated Vaccines - Specific populations are advised against receiving live attenuated vaccines, including immunocompromised individuals, children on aspirin therapy, and pregnant women [4][5]

Core Insights - The flu season in China is being monitored, with varying levels of activity reported in northern and southern provinces, indicating a potential increase in flu cases compared to previous years [2][3] Summary by Sections Flu Activity Monitoring - As of the 42nd week of 2025, flu activity in northern provinces is at a low level, while southern provinces are experiencing an increase, with a total of 49 reported flu-like illness (ILI) outbreaks nationwide [2] - In southern provinces, the ILI percentage reported by sentinel hospitals is 3.8%, which is lower than the previous week (4.1%) but higher than the same period in 2022 (3.2%) and 2024 (3.3%), yet lower than 2023 (5.3%) [2] - Northern provinces reported an ILI percentage of 2.7%, lower than the previous week (2.9%) and below the levels of 2022 (2.8%), 2023 (3.6%), and 2024 (3.4%) [2] - From weeks 14 to 42 of 2025, southern provinces reported 99 ILI outbreaks, which is lower than the 108 outbreaks reported in the same period of 2024, while northern provinces reported 42 outbreaks, higher than the 23 outbreaks in 2024 [2] Vaccination and Prevention - Medical experts suggest that flu cases are currently high, but it remains to be seen if they exceed previous years, and they recommend early vaccination against the flu [3] - Due to the flu virus's tendency to mutate, immunity from flu vaccines diminishes over time, necessitating annual vaccinations [3] - Vaccination is highlighted as the most effective and economical method to prevent flu, significantly reducing the risk of severe complications such as pneumonia and respiratory failure, especially in vulnerable populations like the elderly and children [3] - Additional preventive measures include maintaining a balanced diet, regular exercise, hand hygiene, proper mask-wearing, indoor ventilation, and avoiding crowded places [3]

Core Insights - The recent flu activity in southern China is on the rise, with a notable increase in diagnosed flu cases reported by healthcare professionals [1] - The predominant flu strain this year is H3N2, which differs from last year's H1N1 strain, leading to concerns about vaccine effectiveness [2][3] - Vaccination is emphasized as the most effective preventive measure against flu, with a preference for quadrivalent vaccines over trivalent ones due to better efficacy against circulating strains [4] Group 1: Flu Activity and Symptoms - Flu activity has increased in southern provinces of China, with healthcare professionals observing more patients diagnosed with flu [1] - The main strain circulating this year is H3N2, which has a higher mutation rate compared to H1N1, complicating vaccine matching [3] - Flu symptoms are more severe than those of a common cold, including high fever, severe headaches, and muscle aches, with significant fatigue [2] Group 2: Vaccine Information - There are three types of flu vaccines approved in China: trivalent inactivated, quadrivalent inactivated, and trivalent live attenuated vaccines [4] - Quadrivalent vaccines provide better protection against this year's circulating strains, but trivalent vaccines are still beneficial if quadrivalent options are unavailable [4] - Vaccination should ideally be completed by the end of October to ensure adequate antibody protection before flu season [5]

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].

Core Viewpoint - The flu season in China is expected to arrive earlier this year, with a predominant strain of H3N2, differing from last year's H1N1 strain, leading to lower immunity levels in the population [1][2]. Summary by Sections Flu Characteristics - The main circulating strain this year is H3N2, with an increase in flu cases reported in Japan, the UK, Germany, and Italy since October [2]. - Symptoms of H3N2 include fever, cough, sore throat, body aches, fatigue, and headaches, similar to H1N1 and B strains [3]. Comparison with Common Cold - Flu is caused by influenza viruses (A and B), while common cold is caused by other viruses like rhinovirus [4]. - Flu has a higher transmission rate, significant seasonal peaks, and more severe symptoms, including high fever (39-40°C) and potential complications like pneumonia [4][5]. Vaccination Recommendations - Vaccination is the most effective method to prevent flu and reduce severe cases, with the recommended vaccination period being September to November [6]. - Annual vaccination is necessary due to the rapid mutation of flu viruses, which may differ each year [7]. High-Risk Groups - The National Health Commission recommends vaccination for all individuals over 6 months old, especially for high-risk groups such as children under 5, the elderly over 65, pregnant women, and those with chronic health conditions [8][11]. Pediatric Considerations - Children, especially those under 5, are at higher risk for severe complications from flu, necessitating careful monitoring and care [10][12].

Core Viewpoint - The article emphasizes the importance of flu vaccination as the most effective and economical means of preventing influenza, especially as respiratory infectious diseases become more prevalent in the autumn season [1] Group 1: Vaccination and Monitoring - China has established a nationwide influenza virus monitoring network that includes sentinel hospitals to track influenza-like cases, alongside specialized laboratories for virus isolation, typing, and mutation analysis [1] - The seasonal flu vaccine components are adjusted based on national monitoring data and recommendations from the World Health Organization to ensure better alignment with circulating strains [1] Group 2: Additional Preventive Measures - Experts recommend enhancing protection through three additional strategies: maintaining a regular sleep schedule, balanced diet, and moderate exercise to boost immunity; practicing hand hygiene, proper mask-wearing, and ensuring good ventilation; and minimizing visits to crowded places while seeking medical attention promptly for flu-like symptoms [1]

Core Viewpoint - The article emphasizes the importance of flu vaccination as respiratory infectious diseases, particularly influenza, become more prevalent during the autumn and winter seasons. It highlights the need for public awareness and vaccination efforts, especially for vulnerable populations such as the elderly and children [1][2]. Group 1: Flu Vaccine Effectiveness - Influenza viruses are variable, but vaccines remain effective. China has established a nationwide flu virus monitoring network to track virus changes and adjust vaccine components accordingly, ensuring a match with circulating strains [2]. - Vaccination significantly reduces the risk of severe complications from influenza, such as pneumonia and respiratory failure, particularly in immunocompromised groups [2]. Group 2: Distinction Between Flu and Common Cold - The National Health Commission clarifies that influenza is fundamentally different from the common cold, with more severe symptoms and potential complications. Annual vaccination is recommended to prevent severe cases [3]. - Current vaccination rates are low, indicating a need for increased participation across all demographics, especially among high-risk groups [3]. Group 3: Transmission and Prevention - Influenza primarily spreads through respiratory droplets and can also be transmitted via contaminated surfaces. Crowded places are at higher risk for outbreaks, necessitating good personal hygiene practices [4]. Group 4: Vaccination Timing and Target Groups - The optimal time for flu vaccination is from September to November, with immunity developing within two weeks post-vaccination. High-risk groups, including seniors and those with chronic conditions, should prioritize vaccination [5]. - Both trivalent and quadrivalent vaccines are effective against the current circulating H1N1 strain, and individuals over six months can choose based on recommendations [5]. Group 5: Vaccination Locations - Vaccination should be conducted at qualified medical institutions, such as community health service centers and hospitals. Public can find vaccination sites through health department resources [6].

Core Viewpoint - The article emphasizes the importance of flu vaccination and preventive measures during the autumn and winter seasons, highlighting the effectiveness of vaccines in reducing severe complications from influenza, especially among vulnerable populations [1][2]. Group 1: Flu Vaccination and Monitoring - The Chinese Center for Disease Control and Prevention has established a nationwide flu virus monitoring network to track the changes in flu virus strains and adjust the seasonal flu vaccine components accordingly [1]. - The flu vaccine is recommended annually to ensure it matches the circulating strains, as flu viruses can mutate each year [1]. Group 2: Preventive Measures - In addition to vaccination, the article suggests three key strategies to enhance resistance against flu: maintaining a healthy lifestyle, practicing good hygiene, and being mindful of personal health [2]. - Specific recommendations include regular handwashing, wearing masks, ensuring proper ventilation indoors, and avoiding crowded places [2].