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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 ?
Typhus group rickettsiosis (TGR) is a vectorborne zoonotic disease most commonly caused by the bacteria Rickettsia typhi, the etiologic agent of murine typhus.
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.
Urban focus of Rickettsia typhi and Rickettsia felis in Los Angeles, California.
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).
La transmision transovarica en garrapatas, es el mecanismo de mantenimiento natural para todas la rickettsias del SFG, sin embargo la Rickettsia typhi (del Grupo tifus), R.
Vucuttan baslayarak ekstremitelere, avuc ici ve ayak tabanina yayilan makulopapuler dokuntu varliginda (santrifugal dokuntu) bit kaynakli Rickettsia prowazakii ve pire kaynakli Rickettsia typhi goz onunde bulundurulmalidir (1).
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.
Tradicionalmente, las rickettsias patogenas fueron clasificadas en dos grupos: el tifus (TG) compuesta por Rickettsia prowazekii y Rickettsia typhi, cuyos vectores son piojos (Pediculus humanus) y pulgas respectivamente y, el grupo de las fiebres manchadas (SFG), compuesto por mas de 20 especies con garrapatas como vector principal (3).
Murine typhus is a fleaborne rickettsial disease caused by the organism Rickettsia typhi.