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Related to Rickettsia prowazekii: typhus fever, Rickettsia rickettsii


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 ?
Roles of the Fc receptor and respiratory burst in killing of Rickettsia prowazekii by macrophagelike cell lines.
Rickettsia typhi as well as Rickettsia prowazekii, belongs to Tifus Group in the Rickettsiaceae Family from Rickettsialis Order and is the causative organism of murine or endemic typhus (2).
Traditionally, pathogenic rickettsiae were classified into two groups: the typhus group (TG), composed of Rickettsia prowazekii and Rickettsia typhi, vectored by lice (Pediculus humanus) and fleas, respectively; and the spotted fever group (SFG), composed of more than 20 species mostly vectored by ticks (3).
El doctor en bioquimica Charles Kurland y su equipo de investigadores de la Universidad de Upsala, Suecia, descifraron el codigo genetico de la bacteria transmitida por los piojos, la Rickettsia prowazekii, en 1998.
The BioCyc database collection includes Pathway/Genome Databases for virtually all Category A, B, and C agents, including Bacillus anthracis (anthrax), Rickettsia prowazekii (typhus), and Vibrio cholerae (cholera).
The body louse can transmit the following life-threatening forms of bacteria to humans: Rickettsia prowazekii, which causes epidemic typhus; Bartonella quintana, which causes trench fever; and Borrelia recurrentis, which causes louseborne relapsing fever (2).
First, the genus Rickettsia, which is subdivided into the SF group of more than 20 species and the typhus group with only two species, Rickettsia prowazekii and R.
The TG includes the louse-borne Rickettsia prowazekii (the agent of epidemic typhus) and the flea-borne Ricketsia typhi (the agent of endemic typhus).