Stronger evidence that the mRNA COVID-19 vaccines, from Pfizer and Moderna, could be causing myocarditis, inflammation of the heart muscle or pericarditis, inflammation of the lining of the heart, especially in males aged 16-24.
"Probably due to the inflammation that occurs when you get the vaccine the immune reaction may not only generate antibodies and T cells against COVID-19 but may also generate some reaction against parts of the heart muscle that's likely what the hypothesis is and this is something that needs to be worked out," Adalja said.