| − | A '''zymotic disease''' is a [[disease]] of a contagious nature, presumed to be due to some [[virus]] or organism which acts in the system like a ferment.<ref>{{Nuttall|Zymotic Diseases}}</ref> | + | A '''zymotic disease''' is a [[disease]] of a contagious nature, presumed to be due to some [[virus]] or organism which acts in the system like a [[ferment]].<ref>{{Nuttall|Zymotic Diseases}}</ref> |