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|Noun||1.||family Rickettsiaceae - microorganism resembling bacteria inhabiting arthropod tissues but capable of causing disease in vertebrates|
bacteria family - a family of bacteria
genus Rickettsia - can cause typhus and Rocky Mountain spotted fever in humans
rickettsia - any 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 beings