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url = https://www.npr.org/tags/804916759/covid-19
covid-19 : npr
The companies say a study of more than 10,000 volunteers showed a vaccine efficacy of 95% or greater for people receiving the booster.
November 5, 2021 • Last winter the number of flu cases was pretty low — likely a result of COVID precautions people were taking. Does that mean we have fewer antibodies — and a greater risk of catching something now?