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Rickettsia - Revision history
2026-04-25T19:48:45Z
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<p><b>New page</b></p><div>'''Rickettsia''' is a genus of non-motile, Gram-negative, non-spore-forming, highly pleomorphic bacteria that can present as cocci (0.1 μm in diameter), rods (1–4 μm long), or thread-like (10 μm long). Obligate intracellular parasites, the Rickettsia species are transmitted by numerous types of arthropod, including chigger, ticks, fleas, and lice, and are associated with both human and plant disease.<br />
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== Taxonomy ==<br />
The genus '''Rickettsia''' is included in the phylum '''Proteobacteria''', class '''Alphaproteobacteria''' and family '''Rickettsiaceae'''. It was named after Howard Taylor Ricketts (1871–1910), who studied Rocky Mountain spotted fever in the Bitterroot Valley of Montana, USA at the turn of the 20th century.<br />
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== Pathogenesis ==<br />
Most '''Rickettsia''' species are pathogenic for humans and are transmitted by arthropods such as ticks, fleas, and lice. The pathogenesis of '''Rickettsia''' species are often associated with their ability to invade the endothelial cells that line the blood vessels.<br />
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== Clinical presentation ==<br />
The clinical presentation of '''Rickettsia''' infection can be quite varied, but commonly includes fever, headache, and rash. The severity of disease can range from mild to life-threatening.<br />
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== Diagnosis ==<br />
Diagnosis of '''Rickettsia''' infection is often based on clinical presentation and is confirmed by laboratory testing, including serology and PCR.<br />
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== Treatment ==<br />
Treatment for '''Rickettsia''' infection typically includes the use of antibiotics such as doxycycline.<br />
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== See also ==<br />
* [[Rickettsia rickettsii]]<br />
* [[Rickettsia prowazekii]]<br />
* [[Rickettsia typhi]]<br />
* [[Rickettsia conorii]]<br />
* [[Rickettsia africae]]<br />
* [[Rickettsia australis]]<br />
* [[Rickettsia akari]]<br />
* [[Rickettsia felis]]<br />
* [[Rickettsia sibirica]]<br />
* [[Rickettsia heilongjiangensis]]<br />
* [[Rickettsia japonica]]<br />
* [[Rickettsia canadensis]]<br />
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[[Category:Bacteria]]<br />
[[Category:Gram-negative bacteria]]<br />
[[Category:Intracellular parasites]]<br />
[[Category:Rickettsiales]]<br />
[[Category:Rickettsiaceae]]<br />
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