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infectiousness noun

  • The state or condition of being infectious.
 infectiosité, nature infectieuse

infectious adjective

  /ɪnˈfɛk.ʃəs/
  • (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).
 infectieux
  • (of feelings and behaviour) Spreading quickly from one person to another.
 communicatif
  • (pathology, typically, of a person) Able to infect others; capable of transmitting pathogens.
 contagieux
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