Some researchers have recently said they believe there is a link between mRNA COVID-19 vaccines and a small number of people developing myocarditis — an inflammation of the heart muscle. In the rare cases that the inflammation affects the heart's ability to pump blood, treatments can include anti-inflammatory drugs or steroids. In addition, younger people tend to have stronger immune responses and when they get their second vaccine dose, their immune systems are already primed from the first. So in rare cases, an "overexuberant" immune response can happen, triggering inflammation around the heart, he said. But it's still important for the public and health-care providers to be aware of the potential risk of heart inflammation after the second dose of Pfizer-BioNTech, they said.

Source: CBC News June 05, 2021 00:22 UTC