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Efficacy of Pfizer and AZ vaccines declines after 90 days, study suggests

By Ouyang Xueyan | chinadaily.com.cn | Updated: 2021-08-20 00:26

A COVID-19 infection study led by the Oxford University has found that three months after a second shot of the Pfizer-BioNTech or AstraZeneca vaccine, their efficacy in preventing infections had slipped to 75 percent and 61 percent, according to Reuters.

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