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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 ?
We identified an unusual case of myopericarditis caused by Rickettsia sibirica mongolitimonae, an emerging pathogen in southern Europe with a broad clinical spectrum (1).
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).
Rickettsia sibirica isolation from a patient and detection in ticks, Portugal.
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.
The SFG includes tick-borne Rickettsia rickettsii (the agent of Rocky Mountain spotted fever), Rickettsia conorii (the agent of Mediterranean spotted fever), Rickettsia africae (the agent of African tick bite fever), Rickettsia sibirica (the agent of North Asian tick-borne fever), mite-borne Rickettsia akari (the agent of rickettsialpox), and flea-borne Rickettsia felis (the agent of flea-borne spotted fever) (1,2).
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.
The first case of human infection with Rickettsia sibirica mongoiitimonae was reported in France in 1996 (1).
Rickettsia sibirica subspecies sibirica BJ-90 as a cause of human disease.
Lymphangitis-associated rickettsiosis caused by Rickettsia sibirica mongolitimonae.