FACT-CHECKING: No, The Lancet study does not confirm high risk of myocarditis with Pfizer and Moderna vaccines

Social media ignited. And yet, the truth is quite different.

When social networks get carried away… This Saturday, June 11, scientists from the US Food and drug Administration (which notably authorizes the marketing of drugs in the USA) published a study entitled: “Risk of myocarditis and pericarditis after vaccination anti-Covid in the United States”. A study published in The Lancet, a leading online scientific journal.

A title that has something to catch the eye, knowing that the Side effects of the messenger RNA vaccines have given rise to a great deal of concern and mistrust with regard to the antivax. King of the first degree, the Twitter social network took hold of it. To the extent that “The Lancet” was trending this Tuesday at the start of the afternoon. With tweets such as “A Lancet study confirms the existence of a risk of myocarditis and pericarditis within 7 days of vaccination against Covid-19 with an mRNA vaccine”. What to question.

1 in 36,857 chance

Except that after verification, the truth is quite different. Indeed, the study points the finger at the cases identified in UNITED STATES. Judge for yourself: 411 myocarditis or pericarditis out of… 15,148,369 people vaccinated between December 18, 2020 and December 25, 2021. Or 1 chance in 36,857 of contracting myocarditis or pericarditis. In other words, a small risk. A risk which is above all much less important than that of contracting this pathology after one infection to covid (1/685 according to the CDC, Center for Disease Control and Prevention).

Read also :
The risk of myocarditis, pericarditis and cardiac arrhythmia increases more with the virus than with the vaccine

“An increased risk of myocarditis or pericarditis was observed after COVID-19 mRNA vaccination and was highest in males aged 18-25 after a second dose of the vaccine. However, the incidence was These results do not indicate a statistically significant difference in risk between mRNA-1273 (Moderna) and BNT162b2 (Pfizer), but it should not be ruled out that a difference may exist. than the benefit-risk profile, continue to support vaccination using either of the two mRNA vaccines.

The Lancet publishes an article indicating 411 cases of myocarditis for 15 million vaccinated (i.e. less than 3 cases per 100,000, or 0.0027%) – without mentioning mortality.

But that’s not at all how some communicate on it. https://t.co/q4jraGobOx

— Stats and Society – Survey News (@StatsSociete) June 14, 2022

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