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Vaccines for Covid-19 part 1
Covid-19 2020 November part one
Pfizer

Pfizer announces a 90% effective Covid-19 vaccine      web

webhttps://www.cnbc.com/2020/11/09/covid-vaccine-pfizer-drug-is-more-than-90percent-effective-in-preventing-infection.html
authorSam Meredith
publicationCNBC
date2020-11-09

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