COVID Vaccine Shields Hearts: 40% Drop in Major Events

A recent study reveals that the COVID-19 vaccine lowered the risk of major cardiovascular events, such as strokes and heart attacks, by about 40%. These findings, published in JAMA Internal Medicine, indicate that the heart health benefits previously observed with the vaccine have endured for years.

The research, conducted on approximately one million veterans between 2024 and 2025, compared those who received seasonal flu shots with those who also took an updated COVID-19 vaccine. The cohort receiving the COVID vaccine experienced a 37.7% lower risk of COVID-associated heart conditions.

Interestingly, the vaccine also showed a protective effect against severe heart conditions not linked to COVID-19, reducing their incidence by about 6%. Furthermore, it was associated with a 7% reduction in hospitalizations and deaths from all causes.

These benefits were most pronounced in individuals over 75 and those with pre-existing conditions like cardiovascular disease or diabetes. Extrapolated to larger populations, vaccination could prevent thousands of major cardiovascular events and deaths over an eight-month period.

Researchers suggest the vaccine's broader benefits might stem from protecting against mild, unrecognized COVID-19 infections circulating in the population. While the study population was predominantly older, White, and male, these findings underscore the ongoing importance of vaccination for cardiovascular health.