New study finds vaccine spike proteins may stay in the body up to a year, possibly explaining delayed heart inflammation in some young men after COVID vaccination.
The story
New research suggests spike proteins from COVID vaccines may persist in some people’s bodies for up to a year—not just the few weeks originally thought. This could explain why vaccine-related heart inflammation [myocarditis] shows up days or weeks after injection instead of immediately.
This delayed reaction primarily affects males under 30, especially after their second dose. Researchers have found free-floating spike proteins in people with vaccine-related myocarditis, which aren’t properly neutralized by antibodies and might trigger inflammation in heart tissue.
What’s concerning is that some young men who experienced this condition show signs of heart scarring. This has led health agencies like the CDC to recommend longer spacing between vaccine doses for younger people to reduce risk.
Understanding these findings doesn’t mean vaccines aren’t important tools against COVID—they still protect against severe disease. But it does highlight why ongoing research matters. If you’re worried about your personal risk, especially if you’re a young male, talking with your doctor about the latest findings can help you make the best decision for your situation.
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