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How effective is the first shot of the Pfizer or Moderna vaccine?

  • Written by William Petri, Professor of Medicine, University of Virginia
How effective is the first shot of the Pfizer or Moderna vaccine?UPS employees roll out first doses of the Pfizer vaccine at the UPS hub in Louisville, Ky., on Dec. 13, 2020. Michael Clevenger/Getty Images

As the COVID-19 vaccines reach more people across the country, some people have asked: Could we delay the second dose of the Pfizer and Moderna vaccines to allow more people to be vaccinated more quickly? And,...

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Metropolitan republishes selected articles from The Conversation USA with permission

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