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Moderna Shot Had More Heart Risk Than Pfizer’s in Danish Study

  • While rare, risk was up to four times higher in Moderna shot
  • People still far better off getting shots than catching Covid
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How the Global Vaccine Campaign Has Succeeded—and Failed

The risk of rare heart inflammation side effects was as much as four times higher in people who received Moderna Inc.’s Covid-19 shot than in those who got the vaccine from Pfizer Inc. and BioNTech SE, according to researchers in Denmark.

About 4.2 people per 100,000 who got the Moderna vaccine developed myocarditis or myopericarditis within 28 days of vaccination, with the highest risk seen in those age 12 to 39 and after people received their second doses, according to the study, which was published in the BMJ.