| − | Infectious agents are organisms capable of spreading [[disease]] (e.g. [[bacteria]] or [[viruses]]).<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#i</ref> | + | '''Infectious agents''' are organisms capable of spreading [[disease]] (e.g. [[bacteria]] or [[viruses]]).<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#i</ref> |