Since the pandemic began, doctors have observed that SARS Cov-2 has attacked the heart in addition to the lungs, with an increased risk of developing serious cardiovascular disease.
Vaccines have since arrived, and many of their critics denounce a dangerous injection that poses a health risk. But what do the scientists say?
Researchers from the National University Hospital in Singapore checked international databases of more than 400 million vaccine doses to compare the risk of mypericarditis after an injection of a Covid vaccine and an injection of a vaccine against, for example, influenza or smallpox.
No explosion of heart inflammation cases
Myopericarditis is inflammation of the heart tissue (myocardium) that spreads to the pericardium (the membrane that wraps the heart and the roots of large blood vessels), sometimes resulting in severe and permanent heart damage.
This heart disease is most often caused by viruses or bacteria. In rare cases, however, it can also occur after vaccination.
Thus, the researchers found no appreciable and significant difference between the incidence of this cardiac pathology after vaccination with the vaccine against Covid-19 (18 cases per million doses) and the other vaccines (56 cases per million doses).
Quoted by Medical Newssays Dr. Kollengode Ramanathan, co-author of the study, said that “these results should increase public confidence in the safety of vaccines against Covid-19. »
In the case of the Covid-19 vaccination campaign, the vast majority of post-vaccination myocarditis is mild and heals quickly: 95% of adult cases are considered mild.
In children, 98.6% of cases are mild and do not require mechanical support.
A rare risk that has already been taken into account by the health authorities
The study authors also found that the risk of myopericarditis was higher in people who received messenger RNA vaccines (22.6 cases per million doses) than in people who received non-mRNA vaccines (7.9 cases per million doses). These reported cases were more numerous in those under the age of 30, but also in men and after the second dose of the Covid-19 vaccine.
As early as November 2021, the French health authorities had taken into account the possible risks of myocarditis associated with mRNA vaccines by advising against the Moderna vaccine for people under the age of 30.
This decision followed the publication of a French study that had shown an increased risk of myocarditis and pericarditis in young men under the age of 30, particularly after administration of a second dose of the Moderna vaccine.
However, the researchers point out that the risk of developing myocarditis after contracting Covid-19 is higher than the possibility of developing it after injecting a dose of vaccine against the latter.