流感疫苗技术指南更新，特定人群研发取得突破

Investment Rating - The industry investment rating is maintained at "Overweight" [2][9]. Core Insights - The vaccine industry is currently transitioning from scale expansion to innovation-driven growth, facing short-term pain due to supply-demand imbalance and homogenized competition, but the long-term outlook remains positive driven by policy, demand, and technology [8][9][28]. - Recent breakthroughs in vaccine development for specific populations, such as the quadrivalent influenza vaccine for infants and pregnant women, highlight ongoing innovation in the sector [4][8][9]. - The industry is experiencing structural differentiation among companies, with a focus on innovative and multi-valent products to enhance competitiveness [8][9]. Market Performance - The vaccine sector saw a slight increase of 0.04% last week, while the overall pharmaceutical sector declined by 2.4% [5][11]. - Year-to-date, the vaccine sector has experienced a cumulative decline of 1.57% [5][11]. Company Developments - Companies like Kangtai Biological and Zhonghui Biological are making significant progress in vaccine trials for specific demographics, which could fill market gaps [4][8]. - The latest technical guidelines emphasize the importance of vaccination for high-risk groups, which may drive demand for vaccines [4][8]. Valuation Metrics - The vaccine sector's price-to-earnings (PE) ratio is 99.07X, down 4.97X from the previous period, indicating a high valuation relative to historical standards [7][20]. - The price-to-book (PB) ratio stands at 1.94X, remaining stable, with historical maximum and minimum values of 2.29X and 1.69X respectively [7][20]. Investment Recommendations - The report suggests focusing on companies with strong R&D capabilities and differentiated product offerings, recommending Kangxino and Kanghua Biological as key players to watch [9][28].