It is reported in around 1-2 in every 100,000 people who receive Comirnaty (Pfizer) and around 2 in every 100,000 of those who receive Spikevax (Moderna).
Myocarditis is a known but very rare side effect of the mRNA vaccines. These are usually temporary conditions, with most people getting better within a few days. We are carefully monitoring and reviewing reports of myocarditis and pericarditis (inflammation of the heart or membrane around the heart) following vaccination. More detail on vaccine safety in children, adolescents and adults following vaccination is available in the safety report published on 15 December 2022. Reporting rates of adverse events following COVID-19 vaccination are very stable. The most up-to-date recommendations for use of the COVID-19 vaccines are available from the Australian Technical Advisory Group on Immunisation (ATAGI). This reflects what was seen in the clinical trials. The most frequently reported include injection-site reactions (such as a sore arm) and more general symptoms, like headache, muscle pain, fever and chills. Like all medicines, COVID-19 vaccines may cause some side effects. The protective benefits of vaccination far outweigh the potential risks. Vaccination against COVID-19 is the most effective way to reduce deaths and severe illness from infection. Learn more about causality and our COVID-19 vaccine safety monitoring and reporting activities. We encourage people to report suspected side effects, even if there’s only a very small chance a vaccine was the cause. This is the most intensive safety monitoring ever conducted of any vaccines in Australia. The TGA closely monitors reports of suspected side effects (also known as adverse events) to the COVID-19 vaccines. 
All of these COVID-19 vaccines have met the TGA's high standards for quality, safety and effectiveness. Bivalent vaccines for both mRNA vaccines are also now registered in Australia - Spikevax bivalent vaccine and Comirnaty bivalent vaccine.
Four main COVID-19 vaccines are currently in use in Australia - Comirnaty (Pfizer), Spikevax (Moderna), Vaxzevria (AstraZeneca), and Nuvaxovid (Novavax).
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