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Pfizer's vaccine was 91% effective at preventing symptomatic COVID-19, according to a trial of more than 2,200 kids aged 5-11. See the chart that convinced CDC advisors Pfizer's lower-dose vaccine ...
Booster shots appear to be at least 90% effective against hospitalization for both Delta and Omicron, new CDC data show. One chart shows how well vaccines and boosters protect against severe ...
In July 2020, the vaccine development program Operation Warp Speed placed an advance order of US$1.95 billion with Pfizer to manufacture 100 million doses of a COVID‑19 vaccine for use in the United States if the vaccine was shown to be safe and effective.
A single shot of the Pfizer vaccine cuts the chance of hospital admission and death from Covid-19 by more than 75% among the over-80s, according to real-world data from Public Health England (PHE).
[353] [354] [355] Aiming for a realistic population vaccination coverage rate of 75%, and depending on the actual basic reproduction number, the necessary effectiveness of a COVID-19 vaccine is expected to need to be at least 70% to prevent an epidemic and at least 80% to extinguish it without further measures, such as social distancing. [356]
The COVID-19 vaccine developed by Pfizer and its German partner BioNTech remains 91% effective at protecting against coronavirus for at least six months after the second dose.
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