In the study published in the American Heart Associations peer-reviewed journal Circulation, a detailed analysis of nearly 43 million people, ages 13 and older, has revealed that the risk of myocarditis in unvaccinated individuals after the COVID infection was at least 11 times higher in comparison to people who developed the heart condition after receiving a vaccine or booster dose. Several previous studies from public health agencies, such as the US Centers for Disease Control and Prevention (CDC), have highlighted the connection and increased risk of myocarditis after receiving an mRNA Covid-19 vaccine. 

Dr. Martina Patone, a statistician at the University of Oxford, stated that her team found that in the entire COVID-19-vaccinated population of England, during the pandemic when the vaccines first became available, the risk of myocarditis following vaccination was quite small compared to the risk of myocarditis after infection. She further added that this analysis provides important information that can help in guiding public health vaccine campaigns, particularly since COVID-19 vaccination has expanded in many parts of the world, including among children as young as 6 months old. 

The study analysis found that fewer than 3,000 people were hospitalized or died of myocarditis during the one-year study period. People who were infected with COVID-19 before receiving any doses of the vaccines were 11 times more at risk for developing myocarditis during days 1–28 after a COVID-19 positive test. Dr. Nicholas Mills, Professor and the Butler British Heart Foundation Chair of Cardiology at the University of Edinburgh and a co-author of the paper, stated that it is important for the public to understand that myocarditis is rare, and the risk of developing myocarditis after a Covid-19 vaccine is also rare. This risk should be balanced against the benefits of the vaccine in preventing severe infection. He added that it is also crucial to understand who is at a higher risk for myocarditis and which vaccine types are associated with increased myocarditis risk, etc.

(source: https://health.economictimes.indiatimes.com/news/diagnostics/heart-inflammation-11-times-higher-among-the-unvaccinated-after-covid-oxford-study/93712673 )