Shigella
RANK: Genus
TAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Gammaproteobacteria -> Enterobacteriales -> Enterobacteriaceae -> Shigella
OVERVIEW:
Straight rods, 1–3 × 0.7–1.0 µm, that conform to the general definition of the family Enterobacteriaceae and contain the enterobacterial common antigen. Gram negative. Nonmotile. Non-pigmented. Facultatively anaerobic, having both a respiratory and a fermentative type of metabolism. Catalase positive (with exceptions in Shigella dysenteriae). Oxidase negative. Chemoorganotrophic. Ferment sugars without gas production (a few exceptions produce gas). Salicin, adonitol, and myo-inositol are not fermented. Strains of Shigella sonnei ferment lactose and sucrose upon extended incubation; however, other species do not utilize these substances in conventional medium. Do not utilize citrate, malonate, or sodium acetate (with exceptions in Shigella flexneri for sodium acetate) as a sole carbon source. Do not grow in KCN or produce H2S. Do not decarboxylate lysine. Reduce nitrates to nitrites. Intestinal pathogens of humans and other primates, causing bacillary dysentery. Based on 16S rDNA sequencing, shigellae belong in the Gammaproteobacteria.The mol% G + C of the DNA is: 49–53 (Laskin and Lechevalier, 1981).Type species: Shigella dysenteriae
This genus contains microbial species that can reside in the human gastrointestinal tract. [PMC 4262072]
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Gut associated |
Microbial Abundance Data: Shigella
Percent of total population with standard deviation [PMID: 22698087]. Percentages > 1% highlighted. |
Buccal
Mucosa | Keratinized
Gingiva | Hard
Palate |
Throat | Tonsils | Saliva | Stool |
0.005 %
(0.022) |
0.001 %
(0.007) |
0.007 %
(0.025) |
0.007 %
(0.022) |
0.000 %
(0.000) |
0.016 %
(0.158) |
0.100 %
(0.665) |
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DESCENDANTS
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INTERACTIONS
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