| − | a '''acellular vaccine''' was a [[vaccine]] containing partial cellular material as opposed to complete cells.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref>
| + | An '''acellular vaccine''' is a [[vaccine]] containing partial cellular material as opposed to complete cells.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#a</ref> |