The purpose of this registry is to study the natural history of vaccination-related myocarditis and pericarditis and to assess possible risk factors for these conditions. Primary Objective: \- To document the natural history of confirmed, probable, suspected, and subclinical myocarditis and pericarditis (myopericarditis) following ACAM2000® vaccination. Other Pre-defined Objective: \- To look for potential predictive factors for the prognosis of myopericarditis following ACAM2000® vaccination.
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The number of confirmed, probable, suspected, and subclinical cases of myopericarditis, categorized by time since vaccination
Timeframe: 2 years after enrollment or after the last symptoms or positive findings