巴西国家卫生健康监测局于周一(26日)拒绝进口俄罗斯冠病疫苗“卫星V”,并在周三(28日)解释指,是因为抽验该疫苗加强剂后,发现其中一批含具复制能力的腺病毒,即接种后,腺病毒可在体内自我复制。
“卫星V”属病毒载体疫苗,用基因改造腺病毒传至人体细胞,形成抗原刺激免疫系统。巴西当局科学家直指,上述问题并非病毒载体疫苗技术本身问题,而是生产过程的质量控制出错所致,导致病毒载体的自我复制能力未能消除,恢复自我复制能力。
负责研发疫苗的莫斯科加马列亚研究所否认巴西的说法,强调腺病毒载体不能自我复制。加拿大疫苗和传染病研究组织对此表示忧虑,担心有关问题会令疫苗刺激免疫系统的功能消失,对免疫系统弱的人也可能构成安全问题。
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