Rickettsia rickettsii

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Related to Rickettsia rickettsii: Borrelia burgdorferi, Rickettsia akari, Rickettsia prowazekii

Rick·ett·si·a rick·ett·si·i

a bacterial species, the agent of Rocky Mountain spotted fever, South African tick-bite fever, São Paulo exanthematic typhus of Brazil, Tobia fever of Colombia, and spotted fevers of Minas Gerais and Mexico; transmitted by infected ixodid ticks, especially Dermacentor andersoni and D. variabilis.

Rick·ett·si·a rick·ett·si·i

(ri-ket'sē-ă ri-ket'sē-ī)
The bacterial agent of Rocky Mountain spotted fever and its geographic variants; transmitted by infected ixodid ticks, especially Dermacentor andersoni and D. variabilis.


Howard T., U.S. pathologist, 1871-1910.
Rickettsia akari - a species causing human rickettsialpox.
Rickettsia australis - a species causing a spotted fever.
Rickettsia conrii - an African species probably causing boutonneuse fever.
Rickettsia prowazekii - a species causing epidemic typhus.
Rickettsia rickettsii - the agent of Rocky Mountain spotted fever.
Rickettsia sibirica - the agent of Siberian or North Asian tick typhus.
Rickettsia tsutsugamushi - a species causing tsutsugamushi disease and scrub typhus.
Rickettsia typhi - a species causing murine or endemic typhus fever.
rickettsial - pertaining to or caused by rickettsiae.
rickettsialpox - an acute disease caused by Rickettsia akari; transmitted by the mite.
rickettsiosis - infection with rickettsiae.
rickettsiostatic - an agent inhibitory to the growth of Rickettsia.


a genus of small, rod-shaped, round to pleomorphic microorganisms in the order Rickettsiales. They are true bacteria, gram-negative, and cultivable only in living tissues. Transmitted by lice and ticks, they cause disease in humans and domestic animals but are also found in the cytoplasm of tissue cells of lice, fleas, ticks and mites, which may act as reservoirs and vectors. See also ehrlichia and coxiella.

Rickettsia akari
causes rickettsial pox in humans, mice and rats.
Rickettsia australis
causes queensland tick typhus in humans, small marsupials, rats.
Rickettsia canadensis
causes new typhus in humans and rabbits.
Rickettsia conjunctivae
see Chlamydophila pecorum.
Rickettsia conorii
causes boutonneuse fever in humans and dogs and small feral mammals.
Rickettsia ovina
see Ehrlichia ovina.
Rickettsia phagocytophila
see Anaplasmaphagocytophila.
Rickettsia prowazeki
causes epidemic typhus in humans and possibly cattle, sheep and goats.
Rickettsia rickettsii
causes spotted fever in humans and many feral animals, especially rodents and in dogs and birds. See also rocky mountain spotted fever.
Rickettsia ruminantium
see Ehrlichiaruminantium.
Rickettsia rupricaprae
see Mycoplasmaconjunctivae.
Rickettsia sibirica
causes Siberian tick typhus in humans and many feral mammals, especially rodents.
Rickettsia tsutsugamushi
Rickettsia typhi
causes murine typhus in humans and the brown rat.
References in periodicals archive ?
Molecular typing of isolates of Rickettsia rickettsii by use of DNA sequencing of variable intergenic regions.
Rickettsia rickettsii is transmitted through salivary secretions during a blood meal from an infected tick.
Caused by the bacterium Rickettsia rickettsii, the tick-borne disease destroys cells of the vascular system, leading to low blood volume and fluid-swollen tissues.
The tickborne bacterium Rickettsia rickettsii is the etiologic agent of the deadliest known rickettsiosis, Rocky Mountain spotted fever (RMSF).
Detection of Rickettsia rickettsii in the tick Amblyomma cajennense in a new Brazilian spotted fever-endemic area in the state of Minas Gerais.
Serologic results for Borrelia bergdorferi, Rickettsia rickettsii, Anaplasma phagocytophilum, and Francisella tularensis were negative.
Until 2004, all confirmed cases of tick-borne spotted fever in North, Central, and South America were attributed to 1 pathogen, Rickettsia rickettsii, the cause of Rocky Mountain spotted fever.
Clinical, hematologic, and humoral immune response in female dogs inoculated with Rickettsia rickettsii and Rickettsia montana.
However, a species-specific diagnosis directly implicating infection with Rickettsia rickettsii is obtained for <10% of reported US cases.
Rickettsia rickettsii, Legionella pneumophila, dengue virus), vaccine-preventable diseases (e.
The bacterium Rickettsia rickettsii is the etiologic agent of the deadliest rickettsiosis, Rocky Mountain spotted fever (RMSF), which is referred to as Brazilian spotted fever in Brazil (1).