| − | An efficacy rate is a measure used to describe how good a treatment is at preventing [[disease]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#e</ref> | + | An '''efficacy rate''' is a measure used to describe how good a treatment is at preventing [[disease]].<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#e</ref> |