Viral Infections Significantly Elevate heart Attack and Stroke Risk, New Research Shows
Los Angeles, CA – November 1, 2025 – A new study published in the Journal of the American Heart Association reveals a substantial link between common viral infections like influenza and COVID-19 and a dramatically increased risk of cardiovascular events. Researchers at the University of California, Los angeles, led by Kosuke Kawai, found that the risk of heart attack or stroke rises four to five times in the immediate aftermath of a flu infection, and approximately threefold following a SARS-CoV-2 infection.
The findings underscore the frequently enough-overlooked cardiovascular consequences of viral illnesses,impacting millions and potentially straining healthcare systems. While acute respiratory symptoms are the primary concern during infection, the body’s immune response triggers inflammation and heightened blood clotting – processes that directly endanger the cardiovascular system. This increased risk extends beyond the initial infection period, with other viruses also posing smaller, yet persistent, long-term threats to heart health.
The research team attributes the elevated risk to the immune system’s natural reaction to viral infections. This response releases substances that promote inflammation and blood clot formation, directly impacting cardiovascular function.
Recognizing the meaningful cardiovascular implications, the study authors strongly advocate for increased vaccination rates against viruses known to contribute to heart disease. An overview study from 2022 demonstrated a compelling benefit: flu vaccination was associated with a 34 percent reduction in the risk of serious cardiovascular disease.
This report originated from a broadcast on the Deutschlandfunk program on November 1st, 2025.
