（伦敦25日综合电）有研究显示，接种两剂中国科兴新冠肺炎疫苗（CoronaVac）后，注射辉瑞、庄生或阿斯利康疫苗为加强剂，明显增加体内抗体数量。
研究由英国牛津大学与巴西卫生部联合进行，涉及约1200名已接种两剂科兴疫苗的巴西民众。研究指，研究对象中属于18至60岁群组的民众在注射第三针前，只有20%人侦测到体内有抗体，60岁以上的民众比率更跌至8.9%。
不过在注射阿斯利康、庄生或辉瑞疫苗后，研究对象的抗体数量明显增加，亦对奥密克戎（Omicron）及德尔塔（Delta）变种病毒起保护作用。
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