PARIS, France – The Moderna Covid shot carries a small risk of usually non-serious heart problems, a survey of the entire population of Denmark found Friday.
Incidences of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the tissue surrounding the heart) following Pfizer and Moderna mRNA injections had been noted in vaccine safety reports and small-scale studies.
These reports led France, Denmark and other countries to advise against the shot for people under the age of 30.
“Vaccination with mRNA-1273 (Moderna) was associated with a significantly increased rate of myocarditis or myopericarditis, especially in individuals aged 12-39 years,” the study said.
It stated that vaccination with Pfizer only in women was associated with an increased risk.
The study published in the medical journal BMJ is the first to look at these side effects in an entire population.
While it confirms the risks, it highlights that they are minor and the risks of Covid infection are greater.
It noted that of those vaccinated who developed myocarditis or pericarditis, “only a few” experienced serious consequences.
Of the 21 people diagnosed with the condition after receiving Moderna, more than half were discharged from the hospital within 72 hours, and none died or were diagnosed with heart failure.
“Our finding of a low absolute risk of myocarditis or myopericarditis with BNT162b2 or mRNA-1273 vaccination supports the overall benefits of such vaccination at the individual, societal and global level,” the study concluded.
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