新冠肺炎:3種新冠疫苗各有優缺 袁國勇：接種後若受感染或呈無症狀播毒

袁國勇指，港府採購的3種疫苗未必可阻止無症狀感染。疫苗成為各國對抗新冠肺炎疫情的新希望，但目前疫苗安全性、抗體持續時間等仍然未明。港大微生物學系講座教 ...

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