Two studies published today in
«JAMA Cardiology» suggest that mRNA-based Covid-19 vaccines (Pfizer and Moderna) can cause, in some cases myocarditis, but not on a scale that should prevent people from getting vaccinated.
The first work shows a series of seven patients who underwent cardiac MRI and were diagnosed with myocarditis, of which four had recently received a Covid-19 mRNA vaccine. However, there are only three cases in a population group greater than 550,000 people who had been vaccinated without complications.
The second has seen 23 servicemen who developed myocarditis after receiving a COVID-19 mRNA vaccine. Here the figures are even less relevant, because the