Risk of myocarditis in young people vaccinated with Pfizer? Why it is talked about and what is true

Risk of myocarditis in young people vaccinated with Pfizer? Why it is talked about and what is true
Risk of myocarditis in young people vaccinated with Pfizer? Why it is talked about and what is true

Myocarditis is one of the heart diseases potentially associated with the new Coronavirus. It remains much more likely through Covid-19 than avoiding it with vaccines. Now that the United States and the European Union are organizing to administer the mRNA vaccine Comirnaty by Pfizer-BioNTech even under the age of 16, a report commissioned by the Israeli government emerges, where myocarditis would be related to the German vaccine in some subjects between 16 and 19 years.

For those in a hurry:

  • Cases of myocarditis collected in a recent Israeli government study do not demonstrate a link to Pfizer’s vaccine;
  • Even the cases found by the American CDC are not relevant to establish a potential established risk;
  • At the moment the real or presumed risks are abundantly compensated by the benefits, which protect those already predisposed to have cardiovascular problems from severe forms of Covid.


Previously we had analyzed several theses, based on the misunderstanding of our knowledge on the production of antigens, using mRNA vaccines. These drugs are based on a genetic fragment with only the information to make our cells produce the viral antigen (Spike S protein). It was therefore argued that this mechanism was linked to short- and long-term adverse events, such as rare forms of thrombosis.

From the analyzes carried out through interviews with experts, such as the microbiologist Luca Fanasca and the geneticist Marco Gerdol, it emerged that these are totally unfounded theses. Although preliminary studies show the remote theoretical possibility of one reverse transcriptase in infections due to SARS-CoV-2 (that is, that the gene information is implemented in our genome), this has proved rather an opportunity for future antiviral therapies, while it is excluded that this phenomenon could concern vaccines.

The Israeli study

While waiting to analyze a paper reviewed in a scientific journal, we can draw on the information released by the Israeli health ministry. From these there is no ascertained causal link between Pfizer and myocarditis.

We are talking about just 275 cases collected between December 2020 and May 2021, out of about five million vaccinated. 95% of patients reported mild forms, while 5% were discharged after four days of hospitalization.

“There is a probable link between the administration of the second dose (of Pfizer) of the vaccine and the occurrence of myocarditis among men between the ages of 16 and 30,” says a government statement.

American data

According to the data, the phenomenon concerns in particular the age group between 16 and 19 years. THE CDC Americans recently found similar cases in seven boys between 14 and 19 years old, vaccinated with Comirnaty between April and May of this year.

According to Vaccine Adverse Event Reporting System (VAERS), in the United States there would be a higher than expected number of myocarditis in boys between 16 and 24 years. Nevertheless, this surveillance system is based on mere unverified reports. This is not the first time it has been used to fabricate imaginary vaccine dangers.


It is not possible to establish a causal link between Pfizer’s vaccine and the few cases of myocarditis found in Israel and the United States. Myocarditis and cardiovascular problems in general already have other known risk factors, which in a context of mass vaccination, create a background noise.

In general, the benefits due to vaccination protect the subjects who fall under these risk factors, as Covid-19 can manifest itself in its most serious forms in this type of patients. Conversely, subjects who would have experienced myocarditis after the vaccine did not have significant complications.

Open.online is working with the CoronaVirusFacts/DatosCoronaVirus Alliance, a coalition of more than 100 fact-checkers who are fighting misinformation related to the COVID-19 pandemic. Learn more about the alliance here (in English).

Foto di copertina: ANSA/DANIEL DAL ZENNARO | A health care worker prepares a dose of the Pfizer anti-Covid-19 vaccine at the new vaccination hub set up in Novegro, near Milan, Italy, 20 April 2021.

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