infectious disease

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infectious disease (plural infectious diseases)

  1. (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.
    Synonyms: transmissible disease, communicable disease
  2. (medicine) A medical specialty dealing with the diagnosis, control and treatment of infections.
    Synonyms: ID, infectious diseases, infectious disease medicine, infectious medicine, infectiology, infectology