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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.


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


(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.
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


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.
References in periodicals archive ?
Using this approach, we report 1 of the few documented infections caused by Rickettsia sibirica mongolitimonae.
Agencourt Bioscience Corporation, a provider of genomic services and nucleic acid purification products to the life sciences industry, today announced the publication of a genome-wide protein-protein interaction map of virulence-related genes in Rickettsia sibirica determined using a bacterial two-hybrid system.
Lymphangitis in a Portuguese patient infected with Rickettsia sibirica [letter].
CosMCPrep was used as the exclusive template purification method for Agencourt's work with the Centers for Disease Control and Prevention (CDC) and the University of Maryland School of Medicine in sequencing the genome of the bacterium Rickettsia sibirica, one of the 16 species in the genus Rickettsia known to cause human disease in regions around the world.
Deteccion de Rickettsia sibirica mongolotimonae en biopsia de piel de exantema mediante reaccion en cadena de polimerasa: descripcion de un caso.
To the Editor: Rickettsia sibirica mongolitimonae, a member of the tick-borne spotted fever group (SFG) of rickettsia, was first isolated from Hyalomma asiaticum ticks in China (1).
Ornithodoros papillipes ticks that were sucking blood from guinea pigs infected with Rickettsia sibirica, the agent of North Asian tick typhus, were found to be infected with the bacterium (28).
Genetic differentiation of Chinese isolates of Rickettsia sibirica by partial ompA gene sequencing and multispacer typing.