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Related to Rickettsia rickettsii: Borrelia burgdorferi, Rickettsia akari, Rickettsia prowazekii


n. pl. rick·ett·si·ae (-sē-ē′)
Any of various bacteria of the genus Rickettsia, carried as parasites by many ticks, fleas, and lice, that cause diseases such as typhus and Rocky Mountain spotted fever in humans.

[New Latin Rickettsia, genus name, after Howard Taylor Ricketts (1871-1910), American pathologist.]

rick·ett′si·al adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


n, pl -siae (-sɪˌiː) or -sias
(Microbiology) 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
[C20: named after Howard T. Ricketts (1871–1910), US pathologist]
rickˈettsial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(rɪˈkɛt si ə)

n., pl. -si•as, -si•ae (-siˌi)
any of various rod-shaped infectious microorganisms of the heterogeneous group Rickettsieae, formerly classified with the bacteria but markedly smaller and reproducing only inside a living cell: parasitic in fleas, ticks, mites, or lice and transmitted by bite.
[< New Latin (1916), after Howard T. Ricketts (1871–1910), U.S. pathologist; see -ia]
rick•ett′si•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.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
eubacteria, eubacterium, true bacteria - a large group of bacteria having rigid cell walls; motile types have flagella
family Rickettsiaceae, Rickettsiaceae - microorganism resembling bacteria inhabiting arthropod tissues but capable of causing disease in vertebrates
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


n. ricketsia, rickettsia, uno de los organismos gram-negativos que se reproducen solamente en células huéspedes de pulgas, piojos, garrapatas y ratones, y que se transmiten a humanos a través de las mordidas de éstos.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
Experimental infection of Amblyomma aureolatum ticks with Rickettsia rickettsii. Emerging Infectious Diseases, 17, 829-834.
For example, Rickettsia parkeri rickettsiosis is typically milder, whereas RMSF, caused by Rickettsia rickettsii, the most severe tickborne disease in the United States, can cause severe illness and death (estimated case fatality rate = 5%-10%) (4).
This study presents the case of a Mexican female with persistent language and psychomotor neurologic sequelae 10 years after Rickettsia rickettsii acute infection.
amblyommatis strain Ac37, formerly named Candidatus Rickettsia amblyommii (LABRUNA et al., 2004a; KARPATHY et al., 2016); and Rickettsia rickettsii strain Taiacu (PINTER & LABRUNA, 2006), as previously described by LABRUNA et al.
Two sets of 12-well slides were used for these experiments, one with Rickettsia rickettsii (R.
patinoi, are important vectors of the bacterium Rickettsia rickettsii, the causal agent of the Rocky Mountain spotted fever, the deadliest tick-borne bacterial disease of the world (Krawczak et al.
The patients were evaluated in the months of April, May, and June, and three of the six patients infected with the vector-borne obligate intracellular bacterium, Rickettsia rickettsii, had died within 4 days of hospitalization.
The patients were evaluated in the months of April, May and June, and three of the six patients infected with the vector-borne obligate intracellular bacterium, Rickettsia rickettsii, had died within 4 days of hospitalization.
Rickettsia rickettsii IgM was positive and he was treated with Doxycycline.
Rickettsiae and related ehrlichial organisms are obligate intracellular bacteria carried by mites, fleas, ticks, and lice and are the agents of numerous tick-borne diseases found in Virginia, such as Rocky Mountain spotted fever (Rickettsia rickettsii), Tidewater spotted fever (Rickettsia parkeri), Human monotropic ehrlichiosis (Ehrlichia chaffeensis), and Ewingii ehrlichiosis (Ehrlichia ewingii).