Rickettsiales


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Related to Rickettsiales: Rickettsiaceae, Wolbachia

Rickettsiales

[ri‚ket·sē′ā·lēz]
(microbiology)
An order of prokaryotic microorganisms; gram-negative, obligate, intracellular animal parasites (may be grown in tissue cultures); many cause disease in humans and animals.
References in periodicals archive ?
The taxonomy of Rickettsiales is complex and continues to be updated, but currently the agents of rickettsial diseases are classified as belonging to 4 distinct genera: Rickettsia (including 2 biogroups: spotted fever group [SFG] rickettsiae with >10 species and typhus group [TG] rickettsiae with 2 species), Orientia (Orientia tsutsugamushi, the agent of scrub typhus), Ehrlichia (Ehrlichia chaffeensis, the agent of human monocytic ehrlichiosis), and Anaplasma (Anaplasma phagocytophilium, the agent of human granulocytic anaplasmosis).
Tick-borne rickettsioses are infections caused by obligate intracellular gram-negative bacteria of the spotted fever group (SFG) in the genus Rickettsia and the order Rickettsiales.
To the Editor: Rickettsioses, or typhoid diseases, are caused by obligate intracellular bacteria of the order Rickettsiales.