COVID-19 mRNA vaccines are 94% effective in reducing symptomatic illness |
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COVID-19 mRNA vaccines are 94% effective in reducing symptomatic illness

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The mRNA vaccines are highly effective in protecting against symptomatic COVID-19 among the healthcare personnel (HCPs), according to interim results from the largest COVID-19 vaccine effectiveness study conducted by the CDC. Among fully vaccinated HCPs, the two FDA-approved mRNA vaccines - Pfizer-BioNTech and Moderna - reduced the risk of becoming sick with COVID-19 by 94%.Data for this assessment come from a network covering 500,000 HCP across 33 sites in 25 states in the US, providing additional robust evidence that mRNA vaccines are effective against symptomatic illness in real-world conditions.In this study, the vaccination status of COVID-19 positive cases (n=623) was compared with the vaccination status of those who tested negative, who served as controls (n=1220). Comparison of the odds of COVID-19 vaccination in cases and controls was used to calculate the vaccine effectiveness ...
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