The Numbers of persons who might be vaccinated will not be known until it is determined whether one or two doses of the vaccine will be needed to achieve protection.
被接种人的数量不知道，一直到达到保护是需要一次还是两次疫苗剂量才能确定。
The Numbers of persons who might be vaccinated will not be known until it is determined whether one or two doses of the vaccine will be needed to achieve protection.
被接种人的数量不知道，一直到达到保护是需要一次还是两次疫苗剂量才能确定。
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