Rickettsiales

Rickettsiales
Rickettsia rickettsii (red dots) in the cell of a deer tick
Scientific classification
Domain: Bacteria
Kingdom: Pseudomonadati
Phylum: Pseudomonadota
Class: Alphaproteobacteria
Order: Rickettsiales
Gieszczykiewicz 1939 (Approved Lists 1980)
Families
  • "Candidatus Deianiraeaceae" Castelli et al. 2019
  • Ehrlichiaceae Moshkovski 1945 (Approved Lists 1980)
  • "Candidatus Midichloriaceae" Montagna et al. 2013
  • Rickettsiaceae Pinkerton 1936 (Approved Lists 1980)
  • "Candidatus Tenuibacteraceae" Kroer et al. 2016
  • Genera incertae sedis
    • "Candidatus Anadelfobacter veles" Vannini et al. 2010
    • "Candidatus Repentibacter" corrig. Prokopchuk et al. 2019
    • "Sinorickettsia" Li et al. 2021

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.

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

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