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Rickettsia is a genus of nonmotile, gram-negative, nonspore-forming, highly pleomorphic bacteria that may occur in the forms of cocci (0.1 μm in diameter), bacilli (1–4 μm long), or threads (up to about 10 μm long). The genus was named after Howard Taylor Ricketts in honor of his pioneering work on tick-borne spotted fever.
Rickettsia rickettsii is a Gram-negative, intracellular, cocco-bacillus bacterium that was first discovered in 1902. [1] Having a reduced genome, the bacterium harvests nutrients from its host cell to carry out respiration, making it an organo-heterotroph.
The Rickettsiaceae are a family of bacteria.The genus Rickettsia is the most prominent genus within the family. The bacteria that eventually formed the mitochondrion (an organelle in eukaryotic cells) is believed to have originated from this family.
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Plants of the World is also used for the family and order classification for each genus. The second column gives a meaning or derivation of the word, such as a language of origin. The second column gives a meaning or derivation of the word, such as a language of origin.
They are obligate intracellular parasites, and some are notable pathogens, including Rickettsia, which causes a variety of diseases in humans, and Ehrlichia, which causes diseases in livestock. Another genus of well-known Rickettsiales is the Wolbachia, which infect about two-thirds of all arthropods and nearly all filarial nematodes. [2]
"Spotted Fever Group Rickettsia closely related to Rickettsia monacensis isolated from ticks in South Jeolla Province, Republic of Korea". Microbiology and Immunology. 57 (7): 487–95. doi: 10.1111/1348-0421.12062. ISSN 0385-5600. PMID 23621111. S2CID 206882286.
"Spotted fever rickettsiosis caused by Rickettsia raoultii--case report". Przeglad Epidemiologiczny. 66 (2): 347– 350. PMID 23101229. Selmi, Marco; Martello, Elisa; Bertolotti, Luigi; Bisanzio, Donal; Tomassone, Laura (2009). "Rickettsia slovaca and Rickettsia raoultii in Dermacentor marginatus Ticks Collected on Wild Boars in Tuscany, Italy".
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