Why the U.S. Is Betting on Booster Shots

By now, many public health experts, and the public for that matter, have accepted that vaccinated people may need another dose of whichever COVID-19 shot they received in order to better protect against new variants of COVID-19. And on Aug. 18, the White House endorsed a third dose for those who received either of the two-dose Pfizer-BioNTech or Moderna vaccines. People who received the single-…

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