This CDC study used EHR data from 40 US healthcare systems to calculate risk ratios for cardiac outcomes between patients injected with doses of mRNA COVID-19 vaccinations and others infected with SARS-CoV-2. IT found that "The risk for cardiac outcomes was significantly higher after SARS-CoV-2 infection than after first, second, or unspecified dose of mRNA COVID-19 vaccination for all other groups by sex and age." - Cardiac Complications After SARS-CoV-2 Infection and mRNA COVID-19 Vaccination — PCORnet, United States, January 2021–January 2022
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