The COVID-19 Delta variant which is now subject of the current outbreaks in NSW, QLD and Victoria, has been linked to an increase in cases of cardiac complications in younger people. Though data is still emerging on how common the cardiac side effects are with the Delta variant, myocarditis has also been reported as a very rare side effect of mRNA COVID-19 vaccines (including Pfizer and Moderna) by the Australian Technical Advisory Group on Immunisation (ATAGI) .
According to a US study, while vaccine associated myocarditis and an associated condition, pericarditis (inflammation of the lining around the heart), could be serious, the likelihood of this occurring is low and most cases are reported to resolve quickly. Further to this, the study found that young people were around six times more likely to develop myocarditis from COVID than Pfizer, reiterating that the benefits of vaccination outweigh the risk of adverse effects from COVID-19, including for myocarditis.
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ABC: Why Delta COVID-19 variant could put younger people at risk of deadly cardiac complications