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COVID vaccines

China Zhifei's COVID vaccine largely works on delta variant: study

Efficacy results from Phase 3 clinical trial yet to be published

Researchers cautioned that data from clinical trials or real-world use were still necessary to determine how well the shot prevents people from getting sick from the variants.    © AP

BEIJING (Reuters) -- A COVID-19 vaccine developed by a unit of China's Chongqing Zhifei Biological Products largely retained its neutralising effect against the Delta variant but there was a slight reduction, Chinese researchers found in a laboratory study.

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