A rise in vaccinated people becoming infected with coronavirus has cast doubt over the lasting efficacy of Covid-19 vaccines, according to new studies, including one that found protection gained from the BioNTech/Pfizer shot declined more rapidly than that from the AstraZeneca jab.
根据新的研究，接种过疫苗的人感染新冠病毒的人数增加，使人们对新冠疫苗的持久效力产生了怀疑，其中一项研究发现，来自BioNTech/辉瑞(Pfizer)疫苗的保护作用下降得比阿斯利康(AstraZeneca)疫苗的保护作用更快。
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