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US officials investigating possible Moderna vaccine link to heart inflammation risk, report says

The FDA and CDC are reportedly reviewing whether the vaccine may be associated with a higher risk of myocarditis in young adults.

Sarah Tew/CNET
For the most up-to-date news and information about the coronavirus pandemic, visit the WHO and CDC websites.

Federal health officials are investigating any possible link between the Moderna COVID-19 vaccine and a slightly higher risk of myocarditis in younger adults, according to a report Thursday from the Washington Post.

The US Food and Drug Administration and the Centers for Disease Control and Prevention are reportedly analyzing Canadian data that could suggest the Moderna vaccine carries more risk of heart inflammation for males under the age of 30 than previously thought. 

The report said two people familiar with the review "emphasized the side effect still probably remains uncommon." Myocarditis, or heart inflammation, is a known (though rare) side effect of the Pfizer or Moderna vaccines -- and experts say most cases are mild

An FDA spokeperson told CNET that the agency "won't comment on internal meetings or discussions" but said that it's committed to reviewing available data. 

"We have previously communicated about myocarditis and COVID-19 vaccines and if new information changes the risk/benefit profile, we will update the public accordingly," the spokesperson said.  

Meanwhile, both Pfizer and Moderna are reported to be expanding vaccine studies in children ages 5 to 11. At present, only people 12 or older are eligible to be vaccinated against COVID-19.

Representatives for the CDC didn't immediately respond to CNET's request for comment.

Updated 11:19 p.m. ET: Adds comments from the FDA.

The information contained in this article is for educational and informational purposes only and is not intended as health or medical advice. Always consult a physician or other qualified health provider regarding any questions you may have about a medical condition or health objectives.