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由于另一个以痘苗病毒为基础的艾滋病疫苗没能保护黑猩猩使其免遭病毒感染,因此,艾滋病研究者开始公开承认疫苗的研究比最初所想象的要困难的多。巴斯德研究所(法国巴
Since another vaccinia-based AIDS vaccine failed to protect chimpanzees from the virus, AIDS researchers began to publicly admit that vaccine research was more difficult than initially thought. Pasteur Institute (France and Pakistan