A股流感疫苗板块持续走强，达安基因、华兰疫苗、之江生物涨停

Group 1 - The A-share influenza vaccine sector is experiencing a strong performance, with companies such as Da'an Gene, Hualan Biological Engineering, and Zhijiang Biological reaching their daily limit up [1] - Yongshun Biological has seen an increase of over 10%, indicating positive market sentiment towards the sector [1] - Other companies in the sector, including Dongfang Biological, Biological Shares, Zhongsheng Pharmaceutical, Yiling Pharmaceutical, and Rhine Biological, are also witnessing gains [1]