Summary

Clinico-epidemiological investigations were performed in 11 affected pig farms in different regions of the country. The morbidity rate (12.2 % to 26.5%) was evaluated on the basis of clinical signs, gross and slaughterhouse findings. Gross pathology, histological (specific stainings) and cytological studies were performed with a view to their application for detecting the disease, All known clinico-morphological forms of manifestation of porcine proliferative enteropathies (PPE) were observed throughout our inevstigations. The cases of porcine intestinal adenomatosis and regional ileitis pre-dominated (over 80%). Taking into consideration the totality of gastrointestinal problems faced by pig breeding in Bulgaria, it could be stated that the share of PPE was continuously increasing. Key words: diagnostics, Lawsonia intracellularis, porcine proliferative enteritis, swin