- (written as Communicable Disease)An infectious disease due to an infectious agent (e.g. bacterium, virus, parasitic worm) or its toxic products that arises through transmission from an infected person, animal, or reservoir (such as swamps, contaminated needles) to a susceptible host, either directly or indirectly through an intermediate plant or animal host, vector, or the inanimate environment.
- synonymInfectious Disease
- noun a disease which can be passed from one person to another or from an animal to a person.
- noun a disease caused by microorganisms such as bacteria, viruses or fungi.