General
Pfizer says COVID-19 shot is 91 per cent effective in updated data, protective against South African variant
Pfizer and BioNTech say their COVID-19 vaccine is about 91 per cent effective at preventing the disease, citing updated trial data that included participants inoculated for up to six months.
Key points:
- The new overall efficacy rate of 91.3 per cent is lower than the 95 per cent originally reported in November
- A number of variants have become more prevalent around the world since then
- The drugmakers plan to submit for full US regulatory approval
The shot was also 100 per cent effective in preventing illness among trial participants in South Africa, where a new variant called B1351 is dominant.
However, that rate was derived from a relatively small number of nine infections observed there, which were all in the placebo group.
While the new…
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