An '''epidemic''' is the occurrence of [[disease]] within a specific geographical area or [[population]] that is in excess of what is normally expected.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#e</ref> | An '''epidemic''' is the occurrence of [[disease]] within a specific geographical area or [[population]] that is in excess of what is normally expected.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#e</ref> |