Man in Booster Trial Who Got Pfizer Then Moderna COVID-19 Shots

  • Scientists in the US are starting a booster shot trial, giving fully vaccinated people another jab.
  • Participants are given a booster shot of the Moderna vaccine — whether they previously got 2 shots of an mRNA vaccine (from Pfizer or Moderna) or 1 adenovirus (J&J) shot.
  • One participant told Insider his booster dose of Moderna gave him similar side effects to his second Pfizer shot, but the third was “a little bit more severe.” 
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Virus expert Joseph Hyser has been fully vaccinated since the end of January, and he’s not really worried that his COVID-19 protection from the Pfizer vaccine has waned much since then. 

Yet, when he got an email last month asking if he’d be interested in getting a third dose booster shot — this time from Moderna —…

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