| − | An inactive vaccine is a [[vaccine]] made from [[virus]]es and [[bacteria]] that have been killed through physical or chemical processes. These killed organisms cannot cause [[disease]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#i</ref> | + | An '''inactive vaccine''' is a [[vaccine]] made from [[virus]]es and [[bacteria]] that have been killed through physical or chemical processes. These killed organisms cannot cause [[disease]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#i</ref> |