A Canadian study suggests cases of heart muscle inflammation related to COVID-19 mRNA vaccines are rare but higher than expected among young men who got a second dose of Moderna compared with those who were administered Pfizer-BioNTech's vaccine.
A vial of the Moderna COVID-19 vaccine is seen during a vaccination clinic at the Norristown Public Health Center in Norristown, Pa., Tuesday, Dec. 7, 2021. A Canadian study suggests cases of myocarditis are rare but higher than expected among young men who got a second dose of Moderna, though there's little to no difference between that COVID-19 vaccine and Pfizer-BioNTech following a third shot.
The study, published this week in the Canadian Medical Association Journal, used the data to determine if people sought care for myocarditis seven and 21 days following vaccination. Out of 100,000 second doses of Moderna administered to men between the ages of 18 and 29, the study found 22 cases of myocarditis. That compares with five cases for those who received a second shot of the Pfizer vaccine per 100,000 men in that age group.
“We don’t expect any residual effects given the mildness of illness,” Janjua said of myocarditis involving mRNA vaccines administered to young men, who are otherwise not susceptible to the condition. “Moderna had a better response compared to Pfizer,” Janjua said of the primary doses. “But, of course, with the higher dose, you may see some of these complications, such as myocarditis.”Sign up for our newsletter to get breaking news and daily digests sent to your email.Moderna did not respond to requests for comment on the study or the risk of myocarditis from second doses.
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