Core Insights - The current flu activity in China has reached a high epidemic level, primarily driven by the H3N2 subtype of the influenza virus, which accounts for over 95% of cases reported [2][3]. Group 1: Virus Characteristics - The predominant virus this year is the H3N2 subtype, with minor circulation of H1N1 and B influenza viruses [2]. - No new or unknown pathogens have been detected, indicating that the flu viruses in circulation are well-known [2]. Group 2: Treatment Options - The most widely used antiviral medications in China are Oseltamivir and Baloxavir Marboxil, with specific age-related usage guidelines [4]. - Oseltamivir is approved for individuals over one year old, while Baloxavir is approved for children aged five and older, with the latter requiring only a single dose for treatment [4]. Group 3: Symptoms and Diagnosis - Common flu symptoms include fever, nasal congestion, sore throat, and muscle aches, with variations in severity based on the patient's age and health status [5]. - For young children showing flu symptoms, it is recommended to seek medical evaluation rather than self-medicate at home due to the rapid progression of the disease [6]. Group 4: Monitoring and Prevention - Monitoring the surrounding environment for flu activity and observing symptoms in oneself and close contacts are crucial for early detection [7].