The state or condition of being infectious.

(pathology, of an illness) Caused by an agent that enters the host's body (such as a bacterium, virus, parasite, or prion); often, also, transmitted among hosts via any of various routes (for example, contact, droplet-borne, airborne, waterborne, foodborne, fomite-borne, or bloodborne).

In an infectious manner.

(medicine) An illness caused by a specific infectious agent (bacterium, virus, fungus, protozoa, prion etc.), that results from transmission of that agent from an infected person, animal, or reservoir to a susceptible host.

plural of infectious disease

(pathology) Synonym of mononucleosis

Alternative form of noninfectious

A disease of the respiratory tract of cattle caused by the species Bovine herpesvirus 1.

(medicine) A physician who specializes in the medical field of infectious diseases.

(veterinary medicine) An uncommon but usually fatal cat disease caused by an aberrant immune response to infection with feline coronavirus (FCoV).