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Covid-19 2021 September
Vaccines for Covid-19 part 4

effectiveness of Pfizer Covid-19 vaccine is falling rapidly      web

webhttps://www.post-gazette.com/news/health/2021/09/18/Big-gap-between-Pfizer-Moderna-vaccines-seen-for-preventing-COVID-19-hospitalizations/stories/202109180045
authorMelissa Healy and Amina Khan
publicationLos Angeles Times
date2021-09-18

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