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Stanford Medicine study shows why mRNA COVID-19 vaccine can cause myocarditis, P10


December 10, 2025

Updated on: June 29, 2026

Photo / Image Source: Unsplash,


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But did the two cytokines, together, contribute directly to cardiac injury? The researchers vaccinated young male mice, then found heightened levels of cardiac troponin, the widely used clinical marker of heart muscle damage.

The investigators also noticed infiltration of macrophages and another frontline take-no-prisoners immune-cell type, neutrophils — short-lived first responders that live to die in glorious battle (typically with bacterial or fungal pathogens) and are the main component of pus — into the mice’s cardiac tissue. This also occurs in post-vaccination myocarditis patients.



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