The Truth About Myocarditis and Pericarditis Risk in the Covid-19 Vaccine: Debunking Anti-Vax Claims in France

2023-10-21 12:48:16
The Covid-19 pandemic in FrancedossierSeveral anti-vax accounts believe that the pharmaceutical laboratory has definitively affirmed that the mRNA vaccine “presents increased risks” of myocarditis and pericarditis.

Since the beginning of the week, accounts hostile to anti-Covid vaccines have claimed that Pfizer has “definitively” confirmed, via a press release, the increased risk of myocarditis and pericarditis (two inflammations of the heart muscle) linked to Comirnaty, the product developed with BioNTech, massively administered to the population since its launch on the market in the midst of a pandemic. “Pfizer spills the beans on “the increased risk of myocarditis and pericarditis” with its mRNA product! […] End of September 2023… It comes so late… How many millions of people almost forced into it to keep their job or “have their pass” have never received this essential information?! The totality !” Florian Philippot is outraged on Twitter (renamed X).

Nothing new

In support, the president of the Les Patriotes party shares a screenshot visibly taken from the Pfizer website where we can read, in English: “Myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the outer wall of the heart) have occurred in some people who received mRNA Covid-19 vaccines […] most commonly in adolescent males aged 12 to 17. In most of these people, symptoms appeared within a few days after vaccination.” In another screenshot shared on social networks, we can read that Pfizer subsequently indicates that you should consult a doctor “immediately” if you have one of these symptoms: “chest pain”, “shortness of breath or difficulty breathing” , “feeling of rapid beating, palpitations, or pounding heart.”

We can actually find this passage attached to several press releases from Pfizer published since September on various news from the laboratory, including the last one from October 13 which notably addresses “2023 forecast updates”. But the recognition of this adverse effect, like its mention by Pfizer, is nothing new. We find it, for example, in press releases from January 2022 or September 2021 published by the laboratory.

Recurring type of rumor

Contacted, Pfizer explains the presence of these mentions in its press releases in English: “As is the process in force for all vaccines authorized in Europe, the EMA [Agence européenne des médicaments, ndlr] monitors and evaluates reported cases of adverse reactions related to our Covid-19 vaccine, including very rare myocarditis and pericarditis. In 2021, the EMA recommended updating the summary of product characteristics (SPC) of our Covid-19 vaccine to incorporate this safety information. We have of course followed this recommendation and modified the SmPC of our vaccine. The mention of safety information related to the use of vaccines against Covid-19 in press releases is an obligation in the United States. And recalls: “With hundreds of millions of doses administered worldwide, the benefit-risk profile of our Covid-19 vaccine remains positive for all approved indications and age groups.”

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This type of rumor is recurring regarding the Comirnaty vaccine. In June, CheckNews already answered the question: “Has the National Medicines Safety Agency (ANSM) just added myocarditis and pericarditis to the list of adverse effects of the Pfizer vaccine?” In this case, the French authority had alerted of this risk reported via pharmacovigilance as early as July 2021, in a situation update. In mid-June, two weeks after the launch of the vaccination campaign for the general population, the ANSM specified that its monitoring committee “[retenait] the hypothesis of a possible role of the Comirnaty vaccine in the occurrence of myocarditis. On a European scale, the surveillance system had already taken the subject in hand, as CheckNews explained. In May 2021, the ANSM already specified that the EMA Pharmacovigilance Committee had “begun to assess a potential risk of myocarditis and pericarditis for the Comirnaty and Moderna vaccines”.


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