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Related to Rickettsia typhi: murine typhus, endemic typhus, Rickettsia rickettsii, Rickettsia tsutsugamushi, Rickettsia prowazekii


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 ?
Urban focus of Rickettsia typhi and Rickettsia felis in Los Angeles, California.
Detection of Rickettsia /e/is and Rickettsia typhi and seasonal prevalence of fleas collected from small mammals at Gyeonggi Province in the Republic of Korea.
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).
Murine typhus, caused by Rickettsia typhi, is typically transmitted to humans by Xenopsylla cheopis, a flea that infests rats.
Murine typhus, an acute zoonotic infection caused by Rickettsia typhi (1), occurs worldwide.
Histopathology and immunohistologic demonstration of the distribution of Rickettsia typhi in fatal murine typhus.