A quiet warning may be hiding inside the very shots that helped save millions. New research tied to Stanford Medicine has uncovered a biological trail that could explain why a tiny fraction of mostly young men develop heart inflammation after mRNA COVID-19 vaccination. The findings point to powerful immune signals, rising like a storm inside the body, that might turn protective responses into collateral damage. In lab and animal studies, vaccine components triggered immune cells to release CXCL10 and interferon-gamma, messages that can summon inflammation straight to heart tissue. Even more unsettling: when scientists blocked these signals, heart damage dropped sharply—yet the core immune defense stayed mostly intact. It’s a discovery that could change how we think about boosters, side effects, and the fragile line between protection and pa… Continues…