欧林生物(688319.SH)：签署A群C群脑膜炎球菌多糖结合疫苗市场推广服务协议之补充协议

Group 1 - The core viewpoint of the article is that Olin Bio (688319.SH) has signed a supplementary agreement with Keyuan Trading to optimize the effective period of their original market promotion service agreement for the A group and C group meningococcal polysaccharide conjugate vaccine [1] - The supplementary agreement was reached based on a mutual assessment of the market environment and aims to deepen a stable and long-term cooperative relationship between the two parties [1] - Other core terms of the original agreement remain unchanged despite the optimization of the effective period [1]