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CDC finds higher risk of myocarditis after Covid infection than vaccination


A healthcare worker performs a Covid-19 test in San Francisco, California, on Monday, January 10, 2022.

David Paul Morris | Bloomberg | beautiful pictures

People infected with Covid-19 have a higher risk of myocarditis and other inflammatory heart conditions than those who are vaccinated against the disease, according to a large study led by the Centers for Disease Control and Prevention. Dad on Friday.

The CDC found a higher risk of myocarditis, pericarditis, and multisystem inflammatory syndrome after infection with Covid than after vaccination with Pfizer or Moderna in men and women 5 years of age and older. However, these heart conditions rarely occur after infection and vaccination alike, according to the CDC.

Myocarditis is an inflammation of the heart muscle and pericarditis is an inflammation of the pericardium. Multi-systemic inflammation is a condition associated with a Covid infection that affects multiple organ systems.

Pfizer and Moderna vaccines are associated with an increased risk of myocarditis and pericarditis after a second dose, especially in boys 12 to 17 years of age. However, even in this group, the risk of myocarditis and pericarditis after a Covid infection is higher than after vaccination, according to the CDC.

In adolescent males, the incidence of myocarditis or pericarditis after infection is at least 50 cases per 100,000, compared with at least 22 cases per 100,000 after a second dose of vaccine. The overall risk of heart conditions after a Covid infection is up to 5.6 times higher than with a second dose of the vaccine. The risk after infection is up to 69 times higher than with the first injection.

The CDC examined the electronic health records of more than 15 million people age 5 and older across 40 health care systems between January 2021 and January 2022. Scientists studied the risk of development. cardiac status after a Covid infection compared with the first and second doses of Pfizer and Moderna vaccines. The study excluded the booster dose from the comparison.

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Overall, the risk of heart problems after contracting Covid is 2 to 115 times higher than with the vaccine, depending on age, sex, and dose.

In February, the CDC said males ages 12 to 39 should consider waiting eight weeks between the first and second doses of Pfizer or Moderna vaccine to reduce the risk of myocarditis. Public health authorities of Canada have found that rates of myocarditis following Pfizer or Moderna vaccination are higher when the time between the first and second doses is less than 30 days.

The second dose of Moderna appears to be associated with a higher risk of myocarditis than Pfizer, according to the data presented to the CDC’s committee of vaccine experts in February. Public health authorities in Ontario, Canada have found that the rate of myocarditis in men aged 18-24 years is five times higher after a second dose of Moderna than with Pfizer.

However, the majority of people who develop myocarditis after vaccination recover completely, and most do not report any effect on their quality of life, according to a CDC survey of patients. health care providers presented at the February meeting.



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