Pfizer Covid vaccine is 91% effective in updated data, protective against South African variant

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Pfizer and BioNTech said on Thursday their Covid-19 vaccine is around 91% effective at preventing the disease, citing updated trial data that included participants inoculated for up to six months.

The shot was also 100% effective in preventing illness among trial participants in South Africa, where a new variant called B1351 is dominant, although the number of those participants was relatively small at 800.


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