Yale study reveals insights into post-vaccine heart inflammation cases

When new COVID-19 vaccines were first administered two years ago, public health officials found an increase in cases of myocarditis, an inflammation of the heart muscle, particularly among young males who had been vaccinated with mRNA vaccines. It was unclear, however, what exactly was causing this reaction. In a new study, Yale scientists have identified the immune signature of these heart inflammation cases. These findings, published May 5 in the journal Science Immunology, rule out some of the theorized causes of the heart inflammation and suggest potential ways to further reduce the incidence of a still rare side effect of vaccination, the authors say. Myocarditis is a generally mild inflammation of heart tissue which can cause scarring but is usually resolved within days. The increased incidence of myocarditis during vaccination was seen primarily in males in their teens or early 20s, who had been vaccinated with mRNA vaccines, which are designed to elicit...