Moderna’s COVID-19 shot may cause two to three times as many heart-related side effects as Pfizer’s, according to a new Canadian study.
The rates of myocarditis and pericarditis in individuals within 21 days of getting their second shot were 35.6 and 22.9 per million doses, respectively, for Moderna compared to 12.6 and 9.4 per million for Pfizer, the research found. The connection between the mRNA vaccines and heart complications was most pronounced in men and younger vaccine recipients.
A number of medical bodies and health professionals have raised concerns about the association between mRNA vaccines and heart conditions. Some have pulled back on recommending the mRNA vaccines for young men in particular due to the less favorable risk-reward balance compared to other demographic groups.
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