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rickettsia
 

Definitions from WordNet

Noun rickettsia has 1 sense
  1. Rickettsia - any of a group of parasitic bacteria that live in arthropods (as ticks and mites) and can cause disease if transmitted to human beings
    --1 is a kind of     bacteria, bacterium

Definitions from the Web

Rickettsia

Noun (Medical):

A type of small bacteria that can cause various diseases in humans and animals, including typhus and Rocky Mountain spotted fever.

Sample Sentence: Rickettsia are transmitted to humans through the bites of infected ticks, mites, fleas, or lice.

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