| − | '''Infectious agents''' are organisms capable of spreading [[disease]], such as [[bacteria]], [[virus]]es, [[fungi]], or [[parasite]]s.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#i</ref> | + | '''Infectious agents''' are organisms capable of spreading [[disease]], such as [[bacteria]], [[virus]]es, [[fungi]], or [[parasite]]s.<ref>https://www.cdc.gov/vaccines/about/terms/glossary.htm#i</ref> |