Two markers, interferon-gamma and CXCL10, may rise sharply in rare cases and help draw inflammatory cells toward heart tissue. This could explain why a small number of people experience temporary heart muscle inflammation after vaccination.
Researchers stress that this does not mean mRNA vaccines are broadly unsafe. Instead, it shows how science investigates rare side effects so future vaccines can be made even safer and more personalized.
The main takeaway is progress, not panic. By understanding the immune pathway behind rare complications, scientists may develop better prevention strategies while preserving the protection vaccines are meant to provide.
