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Medical Term:

Koch phenomenon

Pronunciation: kok


  1. infection immunity; living tubercle bacilli, Mycobacterium tuberculosis, do not cause reinfection when inoculated into tuberculous guinea pigs. The animals are immune to reinfection even though their original infection continues to develop and eventually cause their deaths.
  2. rise of temperature and increase of the local lesion in a tuberculous subject following an injection of tuberculin.