| − | In immunology, "'''communicable'''" describes a [[disease]] that can be transmitted from one person or animal to another.<ref>http://www.cdc.gov/vaccines/about/terms/glossary.htm#c</ref> | + | In immunology, "'''communicable'''" describes a [[disease]] that can be transmitted from one person or animal to another.<ref>https://www.cdc.gov/vaccines/about/terms/glossary.htm#c</ref> |