Clinical Signs and Pathological Changes and Differential Diagnosis Of Marek's Disease of Poultry

Abstract

Our study showed that 650 poultry heads were clinically examined at poultry farms in Kashkadarya region, 24 heads of chickens with suspected disease were isolated and clinical signs and pathoanatomical changes were studied. It has been observed that the disease occurs mainly in chickens aged 1-15 days, the incidence can reach 85%. The virus has oncogenic and immunosuppressive activity, which weakens the immunological protection of poultry, as well as increases the susceptibility of poultry to other diseases

The chronic form of Marek's disease manifests itself as an enzotia or sporadic condition, and the acute form as an epizootic. At the first appearance of the disease, almost all susceptible birds become ill. In stationary unhealthy farms, only unvaccinated young birds become ill.

Marek's disease occurs at any time of the year, often in combination with other infectious and invasive diseases. When effective measures to combat Marek's disease are not used, she goes to a hospital with high rates of morbidity (25%) and mortality (94%). There will be many deaths among the birds kept in cages.