contagion medical definition

noun
  1. Disease transmission by direct or indirect contact.
  2. A disease that is or may be transmitted by direct or indirect contact; a contagious disease.
  3. The direct cause, such as a bacterium or virus, of a communicable disease.
  4. The spread of a behavior pattern, attitude, or emotion from person to person or group to group through suggestion, propaganda, rumor, or imitation.

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