Runting Stunting Syndrome (RSS): A Viral Disease in Poultry
Runting-Stunting Syndrome (RSS) is a poultry disease characterized by delayed growth, lowered body weight, and various clinical signs such as pale appearance, malabsorption syndrome, and brittle bone disease. It primarily affects young birds and is associated with viruses like reovirus and other pathogens. The disease manifests with symptoms such as delayed growth, watery diarrhea, and feather abnormalities. Post-mortem lesions include small livers, thin intestinal walls, and feed cloacal impaction. Microscopically, cystic enteritis and pancreatitis are observed. Transmission occurs vertically and laterally. This article discusses the etiology, clinical signs, post-mortem lesions, and transmission of RSS in poultry.
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poultry diseases 2 (u3u3enh) fourth stage chapter three Viral Diseases- lecture 6 PART 1 Runting stunting Syndrome (RSS) Dr.Harith Abdulla Department of Pathology and Poultry Disease College of veterinary medicine university of basrah University of Basrah- College of veterinary medicine- Department of Pathology and Poultry Disease
RSS Is a disease syndrome with several names , characterized by lowered body weight and described as runting-stunting, pale bird, malabsorption syndrome, brittle bone and helicopter wing syndrome. It is a disease of young birds associated with delayed growth , and runts during the first 2-3 weeks of age .
Etiology : Several viruses like reovirus, bacteria and other pathogens.
Clinical signs 1- Severely delayed growth Low uniformity. 2- Pale and stunted. 3-Watery diarrhea soiled vents Damp litter. 4-No early mortality : Late mortality may be high. 5-Occurs at 6-7 days of age , the usual peak of the problem occurs at around 10-12 days of age .
6-a/ As feathers appear on affected birds, smaller than normal and may be curled especially at the wing tips ( Helicopter Disease ). b- The legs and beak of affected birds may appear pale in color ( Pale Bird Syndrome ). c- Some birds may have rickets or broken legs ( Brittle Bone Disease ).
Post-mortem lesions : 1- Small livers with a grossly enlarged gallbladder. 2- Pale , thin , almost translucent intestinal wall with wet pellets of undigested food visible through the intestinal wall. 3- Large amount of fluids inside the small and large intestines. 4- Feed cloacal impaction. 5- Increased amount of pericardial fluid. 6. White or cream-colored plaques in the proventricular glands.
Microscopically: 1- Cystic enteritis. 2-Pancreatitis pancreatic degeneration/ fibrosis. Transmission : 1- Vertical transmission. 2- Lateral transmission.
Diagnosis: 1- Signs. 2-Lesions. 3-ELISA. Differential diagnosis : 1- Mycoplasma synoviae . 2-Staphylococcal arthritis. 3- Spontaneous rupture of the gastrocnemius tendon. 4-Colibacillosis (Synovitis).
Control : 1- Biosecurity . 2- Good poultry house management. 3-Vaccination. Prevention : 1- RSS agents are heat sensitive. 2- Thermal treatment of litter.
