The chief executive of Pfizer says people will probably need a third dose of a Covid-19 vaccine within 12 months of being fully inoculated and may have to receive annual booster jabs.
辉瑞(Pfizer)首席执行官表示在完全接种新型冠状病毒肺炎(COVID-19,即2019冠状病毒病)疫苗后的12个月内,人们可能需要接种第三针疫苗,而且可能每年都要接种加强疫苗。
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