The chief executive of the biotech behind the first Covid-19 vaccine has said a new formulation is likely to be needed by the middle of next year to protect against the virus as it mutates.
制造首個新冠病毒疫苗的生物技術公司的首席執行官表示,到明年年中,可能需要一種新的配方,以防止病毒變異。
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