Rickettsia



noun, plural rickettsiae
[ri-ket-see-ee] /rɪˈkɛt siˌi/ (Show IPA), rickettsias
[ri-ket-see-uh z] /rɪˈkɛt si əz/ (Show IPA)
1.
any member of the genus Rickettsia, comprising rod-shaped to coccoid microorganisms that resemble bacteria but can be as small as a large virus and reproduce only inside a living cell, parasitic in fleas, ticks, lice, and mites and transmitted by bite to vertebrate hosts, including humans, causing such severe diseases as typhus and Rocky Mountain spotted fever.
2.
any rickettsia or rickettsialike microorganism of the orders Rickettsiales and Chlamydiales.
noun (pl) -siae (-sɪˌiː), -sias
1.
any of a group of parasitic bacteria that live in the tissues of ticks, mites, and other arthropods, and cause disease when transmitted to man and other animals

Rickettsia Rick·ett·si·a (rĭ-kět’sē-ə)
n.
A genus of gram-negative bacteria that are carried as parasites by many ticks, fleas, and lice and cause diseases such as typhus, scrub typhus, and Rocky Mountain spotted fever.

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