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Also known as: ''''' Edwardsiella septicaemia '''''—''''' Edwardsiella tarda infection '''''— '''''Edwardsiellosis'''''— ''''' Emphysematous putrefactive disease of catfish '''''— ''''' Fish gangrene'''''— ''''' Red disease'''''.

Also known as: ''''' Edwardsiella septicaemia '''''—''''' Edwardsiella tarda infection '''''— '''''Edwardsiellosis'''''— ''''' Emphysematous putrefactive disease of catfish '''''— ''''' Fish gangrene'''''— ''''' Red disease'''''.

==Introduction==

==Introduction==

Edwardsiella  tarda belongs to the Enterobacteriaceae family and is a Gram negative, small, straight rod, measuring 1 × 2-3mm.  It is motile with peritrichous flagella and they are cytochrome oxidase negative, ferment glucose and are classed as facultatively anaerobic.   

Edwardsiella  tarda belongs to the '''Enterobacteriaceae''' family and is a ''''''motile Gram negative, small, straight rod with peritrichous flagella''' and measures 1 × 2-3mm.  It is '''cytochrome oxidase negative''', and '''ferments glucose''' and is classified as '''facultatively anaerobic'''.   

Edwardsiella tarda infects freshwater and marine fishes, reptiles and amphibians and mammals throughout the world. It causes Edwardsiella septicemia (ES) which is also known as fish gangrene, emphysematous putrefactive disease of catfish or red disease in eels.  It  causes serious systemic infection in cultured channel fish in the USA and in eels and flounders in Japan.  [[      |E.ictaluri]] causes ‘enteric septicaemia of catfish’ (ESC) and only infects fish species and Edwardsiella hoshinae infects birds and reptiles. It can also infect humans and unlike E.ictaluri it is zoonotic.

 

Characteristic necrotic abscesses within the muscle of fish that have a putrid odour when incised are characteristic of ES.  Pale skin and petechiation are also seen. 

''Edwardsiella tarda'' infects '''freshwater and marine fishes, reptiles and amphibians and mammals throughout the world'''. It causes '''''Edwardsiella septicemia (ES)''''' which is also known as '''''fish gangrene, emphysematous putrefactive disease of catfish or red disease in eels'''''.  It  causes serious systemic infection in cultured channel fish in the USA and in eels and flounders in Japan.  Pale skin, petechiation and necrotic abscesses within the muscle of fish (that have a putrid odour when incised) are characteristic of ES.  Mortality rates can depend on the amount of stress that the fish are kept under and high temperature, poor water quality and high organic fertility probably contribute to the onset and severity of the disease.

Mortality rates can depend on the amount of stress that the fish are kept under and high temperature, poor water quality and high organic fertility probably contribute to the onset and severity of the disease.

 

Unlike ''E.ictaluri'', E.tarda is zoonotic and can infect humans. whereas [[Edwardsiella ictaluri|''E.ictaluri'']] causes '''''enteric septicaemia of catfish (ESC)''''' and '''only infects fish species'''' and '''''Edwardsiella hoshinae''' infects birds and reptiles'''''.  

==Signalment==

==Signalment==