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nounany of a group of very small rod-shaped bacteria that live in biting arthropods (as ticks and mites) and cause disease in vertebrate hosts; they cause typhus and other febrile diseases in human beingstype of:
Definition that contains rickettsia
- typhus rickettsial disease transmitted by body lice and characterized by skin rash and high fever
- typhus fever rickettsial disease transmitted by body lice and characterized by skin rash and high fever