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EdwardsiellaRANK: GenusTAXONOMY: cellular organisms -> Bacteria -> Proteobacteria -> Gammaproteobacteria -> Enterobacteriales -> Enterobacteriaceae -> Edwardsiella OVERVIEW: Straight rods, ~1.0 × 2.0–3.0 µm, conforming to the general definition of the family Enterobacteriaceae. Gram negative. Motile by peritrichous flagella, but nonmotile strains may occur. Facultatively anaerobic. Growth occurs on ordinary media with small colonies (0.5–1.0 mm in diameter) after 24 h incubation. Optimum temperature, 37°C, except for E. ictaluri, which prefers a lower temperature. Nicotinamide and amino acids are required for growth. Reduce nitrate to nitrite. Ferment d-glucose with the production of acid and often gas. Also ferment a few other carbohydrates but are inactive compared to many taxa in the family Enterobacteriaceae. Usually resistant to colistin but susceptible to most other antibiotics, including penicillin. Frequently isolated from river fish and cold-blooded animals and their environment, particularly fresh water. Pathogenic for eels, catfish, and other animals, sometimes causing economic losses; also opportunistic pathogen and possibly rare cause of gastroenteritis for humans. A member of the Gammaproteobacteria.The mol% G + C of the DNA is: 53–59.Type species: Edwardsiella tarda This genus contains microbial species that can reside in the human gastrointestinal tract. [PMC 4262072]
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