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The document describes one study as having found that cases of myocarditis and pericarditis, heart inflammations, “were found exclusively in those that received the COVID-19 vaccine,” especially young males.

“No one disputes that, but COVID-19 infections cause far more significant and far more prevalent cases of myocarditis and pericarditis.”

Later analyses showed that the risk for myocarditis and pericarditis, a related condition, is highest after a second dose of an mRNA Covid vaccine in adolescent males aged 12 to 17 years.

The condition also developed among people who received the Pfizer vaccine while researchers identified that pericarditis had a 6.9-fold increased risk for those who received a third dose of AstraZeneca’s vaccine.

Compared with mRNA vaccines, the Novavax booster seems to have a lower risk of causing myocarditis or pericarditis—heart conditions that occasionally occur, especially in young men—although it does not have zero risk.