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.
輝瑞(Pfizer)執行長表示在完全接種新型冠狀病毒肺炎（COVID-19，即2019冠狀病毒病）疫苗後的12個月內，人們可能需要接種第三針疫苗，而且可能每年都要接種加強疫苗。
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