BEIJING : Marking a rare admission from China over the effectiveness of its Covid-19 vaccine, the country's Centers for Disease Control (CDC) said that the efficacy of Chinese coronavirus vaccines is "not high" and they may require improvements, The Washington Post reported.This odd acknowledgement from China CDC director George Gao comes as Beijing has distributed millions of doses to other countries even though Chinese pharmaceutical firms have not released detailed clinical trial data about their efficacy.Addressing a conference in the southwestern city of Chengdu, Gao on Saturday said that China is "formally considering" options to change its vaccines to "solve the problem that the efficacy of the existing vaccines is not high."Soon.
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