#outbreak  a sudden violent spontaneous occurrence of an undesirable condition
  supertype:  #happening__occurrence__natural_event__naturalevent  an event that happens
  subtype:  #epidemic  a widespread outbreak of an infectious disease; many people are infected at the same time
     subtype:  #pandemic  an epidemic that is geographically widespread; occurring throughout a region or even throughout the world
  subtype:  #recrudescence  a return of something after a period of abatement; "a recrudescence of racism"; "a recrudescence of the symptoms"

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