Reovirus infections in fowl - The Veterinary Site

Reovirus infections in fowl

Reovirus infectious disease

Reovirus infections- Avian stunting syndrome/ viral arthritis/ Tenosynovitis is a disease of adult birds of heavy breeds or parent stock caused by reovirus and characterized by swelling of hock joints, lameness and high morbidity with low mortality. After oral infection, the virus settles in joints of the birds.
  • It causes swelling of joint due inflammatory reaction. Rupture of gastrocnemius muscle tendon.
  • Characteristic symptoms are lameness, swelling of hock joint and rupture of gastrocnemius tendon.

Pathogenesis


•After oral infection, the virus settles in joints of the birds


•It causes swelling of joint due inflammatory reaction

•Rupture of gastrocnemius muscle tendon

Tenosynovitis (viral arthritis) is a disease of adult birds of heavy breeds or parent stock caused by reovirus and characterized by swelling of hock joints, lameness and high morbidity with low mortality.
Etiology 


Reovirus, double stranded RNA virus having 10 segments

Very stable virus

Vertical transmission

Characteristic symptoms 

  • Diarrhoea 
  • Soiling of cloaca with semisolid cement like cheesy material ‘Pasty vent’
  • Soiling of toes with fecal matter
  • Stunted growth of birds

Macroscopic features

Stunting of the birds, low weight in about 20-50% of the birds 
Pasty cement like grey coloured deposition on and around vent
Undigested food material in intestine with catarrhal enteritis 

Microscopic features 

Necrosis and desquamation of villus epithelial cells in small intestines
Necrosis of pancreatic islands and proliferation of fibrous tissue
Infilteration of lymphocytes in intestine, pancreas, liver and gall bladder

Diagnosis

Symptoms and lesions
Immunodiagnostic tests
Isolation and identification of virus


Reovirus infections in fowl Reovirus infections in fowl Reviewed by Admin on 16 January Rating: 5

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