1. rickettsia

noun. 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.


  • true bacteria
  • family Rickettsiaceae
  • eubacterium
  • eubacteria

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Sentences with rickettsia

1. Noun, singular or mass
If your dog hosts the wrong tick, he can become infected with rickettsia rickettsii, the organism causing Rocky Mountain spotted fever.