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Pfizer and Moderna vaccines are both safe and have similar effectiveness at preventing COVID-19 illness. Clinical trial data when they were first released in December 2020 showed 95% efficacy for ...
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).
There are three different COVID vaccines to choose from this season: two mRNA vaccines from Pfizer and Moderna, and a protein-based vaccine from Novavax. These vaccines replace the previous COVID ...
[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]
Pfizer’s coronavirus vaccine is 90% effective at preventing hospitalizations for up to six months even as its effectiveness against infections tumbles over time, a new observational study has found.