Heart inflammation requiring hospital care was more common among people who received COVID-19 vaccines than those who did not, according to a new study of tens of millions of Europeans.
Rates of myocarditis or pericarditis, two types of heart inflammation, are above the levels in an unvaccinated cohort, pegged at 38 per 100,000 after receipt of a second dose of a vaccine built on messenger RNA (mRNA) technology in males aged 16 to 24—the group studies have shown are most at risk of the post-vaccination condition—researchers with health agencies in Finland, Denmark, Sweden, and Norway found.
“These extra cases among men aged 16–24 correspond to a 5 times increased risk after Comirnaty and 15 times increased risk after Spikevax compared to unvaccinated,” Dr. Rickard Ljung, a professor and physician at the Swedish Medical Products Agency and one of the principal investigators of the study, told The Epoch Times in an email.
Comirnaty is the brand name for Pfizer’s vaccine while Spikevax is the brand name for Moderna’s jab.
Rates were also higher among the age group for those who received any dose of the Pfizer or Moderna vaccines, both of which utilize mRNA technology. And rates were elevated among vaccinated males of all ages after the first or second dose, except for the first dose of Moderna’s shot for those 40 or older, and females 12- to 15-years-old.
Researchers pulled data from national health registers, analyzing 23.1 million people aged 12 or older. The analysis was of data from Dec. 27, 2020, to incidence of myocarditis or pericarditis, or the end of the study time period, which was Oct. 5, 2021.
“The risks of myocarditis and pericarditis were highest within the first 7 days of being vaccinated, were increased for all combinations of mRNA vaccines, and were more pronounced after the second dose,” researchers wrote in the study, which was published by the Journal of the American Medical Association following peer review.
Moderna and Pfizer did not respond to requests for comment.