Myopericarditis

This is a prospective observational phase IV study of a novel, replication-deficient smallpox vaccine that has been recently been approved by FDA. The purpose of this study is to determine if there are any abnormalities detected by electrocardiographic testing and/or blood tests within 35 days of receiving the second dose of smallpox vaccine either alone or co-administered with other vaccines that may/may not be suggestive of myopericarditis.