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Rickettsiales

Su, Si;Hong, Mei;Cui, Meng-Yu;Gui, Zheng;Ma, Shi-Fa;Wu, Lin;Xing, Li-Li;Mu, Lan;Yu, Jing-Feng;Fu, Shao-Yin;Gao, Rui-Juan;Qi, Dong-Dong

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Rickettsiales

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The Rickettsiales, informally called rickettsias, are an order of small Alphaproteobacteria. 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. Genetic studies support the endosymbiotic theory according to which mitochondria and related organelles developed from members of this group. However, more recent examina

Species

リケッチア目

ORDER

  1. KingdomBacteria
  2. PhylumProteobacteria
  3. ClassAlphaproteobacteria
  4. OrderRickettsiales
Observations recorded383,089

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Wikidata facts

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Rickettsia rickettsii.jpg
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Commons category
Rickettsiales
taxon name
Rickettsiales
Sources (2)

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~3 min read

Article

4 sections
Contents
  • Rickettsiales phylogeny
  • Phylogenetic relationship between Rickettsiales and Pelagibacterales (SAR11)
  • Reductive evolution
  • References

The Rickettsiales, informally called rickettsias, are an order of small Alphaproteobacteria. 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. Genetic studies support the endosymbiotic theory according to which mitochondria and related organelles developed from members of this group. However, more recent examination has suggested that the mitochondria and Rickettsiales diverged independently.

The Rickettsiales are difficult to culture, as they rely on living eukaryotic host cells for their survival.

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