Pfizer COVID-19 vaccine just 42% effective against infection amid delta spread, preprint suggests
Fox News
Early findings posted ahead of rigorous peer review suggested the Pfizer COVID-19 vaccine declined to 42% effectiveness against infection amid sweeping spread of the delta variant, with the Moderna vaccine declining to 76%.
The study period analyzed samples from January to July, when either the alpha or delta variant was a highly prevalent strain; "the Delta variant prevalence in Minnesota increased from 0.7% in May to over 70% in July whereas the Alpha variant prevalence decreased from 85% to 13% over the same time period," the preprint reads.
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