Core Viewpoint - The flu-related stocks experienced a significant surge on October 21, with notable increases in companies such as Te Yi Pharmaceutical, Jinshi Yao, and Hualan Vaccine, driven by rising flu activity in southern China and predictions of an earlier flu season this year [1][4]. Group 1: Stock Performance - Te Yi Pharmaceutical reached a trading limit with a price of 10.27, reflecting a 9.96% increase [2] - Jinshi Yao saw a price increase to 11.73, marking a 15.11% rise [2] - Hualan Vaccine's stock rose to 22.15, showing an 11.87% increase [2] - New Ganjing's stock price increased to 23.72, with a rise of 11.41% [2] - Other companies like Hengdi Pharmaceutical and Xiangrikui also followed the upward trend [1]. Group 2: Flu Activity and Predictions - The China CDC reported an increase in flu activity in southern provinces, indicating a potential early onset of the flu season this year [4] - Experts noted that the predominant flu strain this year is H3N2, differing from last year's H1N1 strain, which may lead to lower immunity levels in the population [5]. Group 3: Vaccination Recommendations - Vaccination is emphasized as the most effective method to prevent flu and reduce severe cases, with recommendations for individuals to get vaccinated between September and November [8] - The flu vaccine needs to be administered annually due to the rapid mutation of the virus, ensuring protection against the current year's strains [8][9]. - High-risk groups, including children under 5, the elderly, and individuals with chronic health conditions, are advised to prioritize vaccination [12].