This article examined the prevalence of Marek's disease among poultry, as well as its etiological factors. For this purpose, the epizootic situation was checked for infectious diseases found in individual poultry farms of the republic and among the poultry population. They were selected for verification on the recommendation of employees of the veterinary service of poultry farms. At the plants, all birds underwent clinical examination, patients were isolated and treated, dead or forcibly slaughtered birds were subjected to pathoanatomical studies. We got acquainted with the level of organization of veterinary and sanitary, feeding, and security measures. The diseases were diagnosed based on the results of epizootological, clinical, pathoanatomic, bacteriological, virological, and ELISA examinations. According to the results of an analysis conducted on the available poultry stock in individual poultry farms, farms, clusters, LLC companies and private entrepreneurs of our republic, it was found that the incidence of birds in the areas examined for Marek's disease is 2-5 percent compared to the total number of 15400 heads examined, while the mortality rate from this disease is about 13.2 percentages.

Marek, immunoglobulin, vaccine, immunity, immunophone, antigen, epizootology, clinical, pathologoanatomics', bacteriologist, virologist, epidemiology, pathobiology.

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