REOVIRUS INFECTIONS

Malabsorption syndrome Viral arthritis-tenosynovitis Malabsorbtion syndrome Especially in broiler and turkey pants The growth of the growth Live weight losses Delay in feathering Reverse and coarse pilling Foot and gag color opening Non-bone formation and enteritis

Viral arthritis-tenosynovitis Broiler and broiler breeders and young turkeys Arthritis, inflammation of the synovial membrane, tendon, tendon and myocardium Bump over one or both knees at the knee joint Lameness

Etiology Reovirus Nucleic acid in the form of double stranded RNA Poultry reoviruses are resistant to low pH such as ether, chloroform, pH 3, trypsin and sodium deoxycholate resistance. The virus is also very resistant to heat inactivation. Unlike mammalian reoviruses, there are no poultry reoviruses and hemagglutination and hemadsorbing properties. Poultry reoviruses are produced in embryonic eggs and primary cell cultures

With the aim of isolating and producing virusun, the egg yolks of embryonic chicken eggs are inoculated and the embryos usually die within 3-5 days. In addition, reoviruses also grow on chorioallantoic membranes of 10-day embryonic chicken eggs. Following the replication of the virus, the embryo dies within 3-5 days and large necrotic membranes form on the chorioallantoic membrane. After inoculation to the allantoic cavity, embryo deaths usually do not occur and isolation and production of the virus is not appropriate.

Primary chicken embryo tissue cultures are also used to produce poultry reoviruses At least 11 serotypes were found in poultry reoviruses. There are important variations between virulence of antigenically similar isolates.

Epidemiology Poultry reoviruses have vertical transmission characteristics. Vertical transmission is known to reduce egg-laying rate and increase premature chick deaths. Reovirus infections can be transmitted directly and indirectly from one animal to another. The spread of the infection is mainly caused by the intake of feces, contaminant food and water. Reoviruses are resistant to heat and disinfectants, causing them to survive in hatcheries and barns.

Clinical findings Reovirus infections are the main two syndromes in birds.

Malabsorption syndrome Growth in broilers is characterized by persistence, scabies, diarrhea, decreased fertility, weak feathering, encephalomalacia, weakness in the legs, skeletal deformities and inferior pigmentation. Although this syndrome has been known for a long time, it has been known as a mineral substance (Ca, P), vitamin deficiencies (A, D, E, B), toxicities (mycotoxicosis), viral diseases (IBD) and protozoon diseases (coccidiosis) It has been identified. However, intensive research done in recent years has shown that end result syndrome is brought to the market by reoviruses.

Viral arthritis / tenosinovitis It is a viral infection characterized by synovial membranes, tendons, tendonitis, myocardial infarction, arthritis and lameness. In acute cases, it is seen that the rate of death, non-development and nutritional benefit is low. The disease is found in chicken and turkeys.

Diagnosis 1- Clinic and necropsy findings 2- Laboratory examinations a) Virus isolation b) Serological tests

Protection Vaccinations