An illness caused by an infectious agent or its toxins that occurs through the direct or indirect transmission of the infectious agent or its products from an infected individual or via an animal, vector or the inanimate environment to a susceptible animal or human host.

Synonyms: Diseases, Communicable, Communicable Disease, Diseases, Infectious, Infectious Disease, Infectious Diseases, Disease, Communicable, Disease, Infectious, Communicable Diseases