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Research in mice has shown that injecting vaccines into veins can cause myopericarditis. Chances of injecting into a vein are reduced by using a technique called aspiration (insert needle, draw up to check for blood, and then inject). Pfizer recommends using this technique in its vaccine literature. It appears that nurses and doctors in the US and UK are not aspirating when they jab.

Abstract Background: Post-vaccination myopericarditis is reported after immunization with COVID-19 mRNA-vaccines. The effect of accidental intravenous injection of this vaccine on the heart is unknown. Methods: We compared the clinical manifestations, histopathological changes, tissue mRNA expression and serum levels of cytokine/chemokine in Balb/c mice at different time points after intravenous(IV) or intramuscular(IM) vaccine injection with normal saline(NS) control. Results: Though significant weight loss and higher serum cytokine/chemokine levels were found in IM group at 1 to 2 days post-injection(dpi), only IV group developed histopathological changes of myopericarditis as evidenced by cardiomyocyte degeneration, apoptosis and necrosis with adjacent inflammatory cell infiltration...