''Edwardsiella'' is a genus of

gram-negative Gram-negative bacteria are bacteria that, unlike gram-positive bacteria, do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. Their defining characteristic is that their cell envelope consists ...

fermentative Fermentation is a type of anaerobic metabolism which harnesses the redox potential of the reactants to make adenosine triphosphate (ATP) and organic end products. Organic molecules, such as glucose or other sugars, are catabolized and reduced ...

bacteria of the family

Hafniaceae The ''Hafniaceae'' are a family (biology), family of Gram-negative bacteria. This family is a member of the order Enterobacterales in the class Gammaproteobacteria of the phylum Pseudomonadota. Genera in this family include the type genus ''Hafni ...

. It was first discovered in snakes in 1962.

Description

A genus of gram-negative, facultatively anaerobic, rod-shaped bacteria of the family

, they are occasionally opportunistic pathogens of humans.

Species

Notable species include: * ''Edwardsiella hoshinae'', a motile species that, isolated from animals and humans, does not produce

indole Indole is an organic compound with the formula . Indole is classified as an aromatic heterocycle. It has a bicyclic structure, consisting of a six-membered benzene ring fused to a five-membered pyrrole ring. Indoles are derivatives of indole ...

. * ''Edwardsiella ictaluri'', a nonmotile species that does not produce indole, and occurs as a pathogen of

catfish Catfish (or catfishes; order (biology), order Siluriformes or Nematognathi) are a diverse group of ray-finned fish. Catfish are common name, named for their prominent barbel (anatomy), barbels, which resemble a cat's whiskers, though not ...

. * ''Edwardsiella tarda'', also known as ''Edwardsiella anguillimortifera'', a species which produces indole, is biochemically similar to ''

Escherichia coli ''Escherichia coli'' ( )Wells, J. C. (2000) Longman Pronunciation Dictionary. Harlow ngland Pearson Education Ltd. is a gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus '' Escherichia'' that is commonly fo ...

''. It is usually found in aquatic animals and reptiles, and is found in the intestinal tract of snakes and seals. It is occasionally isolated from the urine, blood, and faeces of humans, and has been known to cause gastroenteritis and wound infections. In India, it has been found in children with diarrhoea.

References

Enterobacterales Bacteria genera {{Enterobacterales-stub