An advisory panel for the Centers for Disease Control and Prevention has found a “potential association” between rare heart inflammation and Covid-19 mRNA vaccines in teens, although it said the benefits of the vaccines far outweigh the risks.
The health agency is monitoring cases of myocarditis and pericarditis reported after the first and second doses of Moderna vaccine and BioNTech/Pfizer mRNA in people over 12 years of age.
Myocarditis is inflammation of the heart muscle, and pericarditis is inflammation of the membrane surrounding the heart.
There were 323 confirmed cases among people who received the vaccine for either or both cases in the United States as of June 11, with 309 people needing hospital treatment. The Centers for Disease Control and Prevention’s Vaccine Safety Technical Working Group said nearly 80 percent of people with confirmed cases have made a full recovery.
The rare side effect is observed primarily in young adults and is most common in men 30 years of age or younger.
In subjects 12 to 39 years of age, 4.4 reports were reported per million vaccine doses administered for either issue. Experts said at an advisory meeting on Wednesday that the report rate rose to 12.6 per million after the second dose.
The majority of patients experienced symptoms including chest pain, shortness of breath and heart palpitations within a week of the vaccination.
More than 150 million Americans have been fully vaccinated, according to figures from the Centers for Disease Control and Prevention.
Heart-related problems are the second type of unusual side effect to be discovered as Covid-19 vaccines have been rapidly distributed around the world. AstraZeneca and Johnson & Johnson vaccines have been linked Rare blood clotsThe launch of both methods was paused in several countries earlier this year while the scientists were present Investigate why.
Members of the Committee for Disease Control and Prevention recommended delaying the second dose of the mRNA vaccine — a class that includes vaccines made by BioNTech/Pfizer and Moderna — if the teen has a rare condition after the first shot.
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“This is an extremely rare side effect, and very few people will experience it after vaccination,” doctors from the US Department of Health, the Centers for Disease Control and Prevention (CDC) and others said in a statement after the meeting.
“Most cases are mild, and individuals usually recover on their own or with minimal treatment. Additionally, we know that myocarditis and pericarditis are more common if you develop Covid-19, and that the risks to the heart from Covid-19 infection can be more severe.”
Doran Fink, deputy director of the FDA’s Office of Vaccine Research, said the regulator would “move quickly” to include cautionary statements for health care providers and vaccine recipients about the reaction.
Moderna shares closed down 4.2 percent on Wednesday, while US-listed BioNTech shares fell 3 percent and Pfizer fell 1.4 percent.