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pfizer covid 19 vaccine

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Roger Seheult, MD of MedCram discusses how and when the transmission prevention capability of vaccines were tested during the COVID-19 pandemic. See all Dr. Seheult’s videos at: https://www.medcram.com (This video was recorded on October 16, 2022) Roger Seheult, MD is…

How Hard to Achieve HERD IMMUNITY?

The Pfizer vaccine showed 95% efficacy against the development of COVID-19. If the vaccine could also prevent transmission of the virus by 95%, then assuming basic reproduction number (R0) of SARS-CoV-2 as 3, around 71% [(1-1/R0)x(100/95)] would need to be…