Group 1 - The core viewpoint of the articles highlights the early onset of the flu season in China, with the H3N2 subtype being the dominant strain, accounting for 95% of the circulating flu viruses [1][2] - The flu activity is currently on the rise, particularly in southern provinces like Guangdong and Hainan, where the positive detection rate for flu viruses is 10%, compared to 6% in northern provinces [1] - Experts confirm that the current H3N2 strain is not a new subtype, and existing vaccines are effective against it, with a higher match rate than in previous years [2] Group 2 - Symptoms of different flu virus subtypes, such as H1N1 and H3N2, are generally similar, including high fever, muscle aches, and respiratory issues, although H1N1 may present more severe symptoms in younger and obese individuals [4][7] - Antiviral treatments like Oseltamivir and Marboxil are crucial for flu management, and it is important to avoid antibiotic misuse as flu is caused by a virus [5][6] - There is a misconception that flu vaccines can cause virus mutations; however, experts clarify that vaccines do not induce mutations and are beneficial in reducing infection risk [10]