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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 ?
tsutsugamushi (Otsu47) and murine typhus was diagnosed based on the outer membrane protein B gene of Rickettsia typhi (Rtyph).
rickettsii) Sheila Smith strain and the other with Rickettsia typhi (R.
Histopathology and immunohistologic demonstration of the distribution of rickettsia typhi in fatal murine typhus.
According to the company, the DPP Fever Panel Assay will include a quality control and nine tests aimed at parasitic, viral and bacterial pathogens commonly responsible for fever symptoms in the Asia Pacific region, including malaria (four Plasmodium species, using pLDH and HRP2), dengue virus, Zika virus, chikungunya virus, leptospirosis, Rickettsia typhi, Burkholderia pseudomallei, and Orientia tsutsugamushi.
Walker, "Rickettsia typhi (murine typhus)," in Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases, J.
Urban focus of Rickettsia typhi and Rickettsia felis in Los Angeles, California.
Complete genome analysis from several Rickettsia species actually propose a new division in four rickettsial groups: Tifus group (Rickettsia typhi y Ricketsiaprowazekii); Spotted fever Group (Rickettsia conorii, Rickettsia sibirica, Rickettsia rickettsii); Ancestral Group (Rickettsia canadensis y Rickettsia bellii) and transition Group (Rickettsia felis y Rickettsia akari) (2).
Only two pathogenic rickettsial species are classified in the typhus group: (1) Rickettsia prowazekii, the causative pathogen of human body louse-borne epidemic typhus and its milder recrudescence (Brill-Zinsser disease), and flying squirrel-associated epidemic or sylvatic typhus in the eastern US; and (2) Rickettsia typhi, the causative pathogen of murine (endemic) typhus worldwide.