652099 external_news 1635277997 1635277997 Medical experts were hoping the Covid vaccines would help the U.S. reach herd immunity, but now there is uncertainty over what it will take to achieve it. Early in the pandemic, healthcare experts estimated we would need 60 to 70% of the U.S. population to have some form of immunity to stop the spread. M.G. Finn, professor and Chair, and James A. Carlos Family Chair for Pediatric Technology in the School of Chemistry and Biochemistry, said variants of the coronavirus have thrown a kink in the numbers game.

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