Lesions caused by virulent Aeromonas hydrophila in farmed catfish ( Ictalurus punctatus and I. punctatus × I. furcatus) in Mississippi
| Autor: | Lorelei Ford, Wes Baumgartner, Larry A. Hanson |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Veterinary medicine General Veterinary fungi Severe disease Virulence Aquatic animal 04 agricultural and veterinary sciences Biology biology.organism_classification Aquatic organisms Aeromonas hydrophila Fishery 03 medical and health sciences Fish Diseases 030104 developmental biology Mississippi Ictalurus 040102 fisheries 0401 agriculture forestry and fisheries Animals Gram-Negative Bacterial Infections Catfishes Catfish |
| Zdroj: | Journal of veterinary diagnostic investigation : official publication of the American Association of Veterinary Laboratory Diagnosticians, Inc. 29(5) |
| ISSN: | 1943-4936 |
| Popis: | In 2009, a virulent strain of Aeromonas hydrophila caused severe disease and high mortalities (motile aeromonad septicemia variant [MASv]) in farmed channel catfish ( Ictalurus punctatus) and hybrid catfish ( I. punctatus × I. furcatus) in eastern Mississippi and Alabama. As is common in MAS, there is severe hemorrhagic dermatitis with ulceration, as well as abdominal hyperemia, petechiation, and mild ascites. Additional findings in MASv cases include panophthalmitis and orbital cellulitis, leading to ocular rupture, and brains are often hyperemic with mild random acute hemorrhage. In MASv infections, there is consistently also marked hemorrhage and edema in the submucosa and muscularis of the stomach, with lymphangitis and a few bacteria, plus splenomegaly with infarcts. Microscopically, spleens have necrosis of ellipsoids with macrophage infiltration and small numbers of bacteria; however, large infarcts are filled with bacteria. Other organs, such as liver, kidneys, and intestine, which are typically associated with MAS caused by various aeromonad species, are less affected. The findings in the stomach have not been reported in MAS in farmed catfish, to our knowledge, and the splenic changes are highly characteristic of MAS compared to infection with other gram-negative bacteria, including Edwardsiella ictaluri and other aeromonad species and strains. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|