| Morphology | Edwardsiella |
| CELLULAR |
| Staining | Gram-negative |
| Morphology | Small straight rods, about 1 um in diameter x 2-3 um.. |
| Motility | Motile by peritrichous flagella |
| Specialized structures |
| Division |
| COLONIAL |
| Solid surface | Growth occurs on peptone and similar agar media with small colonies (about 0.5-1 mm in diameter) after 24 h incubation. |
| Liquid |
| Growth Parameters | Edwardsiella |
| PHYSIOLOGICAL |
| Tropism | |
| Oxygen | Facultatively anaerobic. |
| pH | |
| Temperature | Optimum temperature, 37`C, except for E. ictaluri which prefers a lower temperature |
| Requirements | Vitamins and amino acids are required for growth |
| Products | Reduce nitrate to nitrite Ferment D-glucose with the production of acid and often visible gas. Also ferment a few other compounds but are inactive compared to many taxa in the family Enterobacteriaceae |
| Enzymes | Catalase-positive. Oxidase-negative |
| Unique features | Usually resistant to colistin but have large zones around most other antibiotic disks, including penicillin. |
| ENVIRONMENTAL |
| Habitat | Frequently isolated from cold-blooded animals and their environment, particularly freshwater. |
| Lifestyle | |
| Pathogenicity | Pathogenic for eels, catfish, and other animals, sometimes causing economic losses; also a rare opportunistic pathogen for humans. |
| Distribution |
| Genome | Edwardsiella |
| G+C Mol % | 53-59 |
| Reference | Edwardsiella |
| First citation | Ewing ,W.H.,A.C. McWhorter, M.R. Escobar and A.H. Lubin (1965) Edwardsiella, a new genus of Enterobacteriaceae based on a new species E. tarda. Int Bull Bacteriol. Nomen Taxon 15:33-38 |
| The Prokaryotes | P |
| Bergey's Systematatic | p 486 J.J> Farmerr and A. C. McWhorter |
| Bergey's Determinative | p 178 |
| References |