BEIJING (Reuters): China's CanSino Biologics Inc said the efficacy rate for its single-dose Covid-19 vaccine may fall over time although it should still have a rate of 50% or more five to six months after inoculation.
A second shot given to trial participants six months after their first injection could offer substantial protection, Zhu Tao, CanSinoBIO's chief scientific officer, said in an online presentation late on Wednesday (March 31).
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