EN
The examinations concerned 26 dead foals sent for the diagnostic purposes from the English thoroughbred and halfbred studs located in the Silesia district. From the samples of 14 foals EVA was isolated in cell cultures. The results of gross, histopathological and bacteriological studies were described. Eight foals were below 14 days and the others between 2 and 4 months. Necropsy of the foals showed a variety of gross lesions due to the secondary bacterial infection. There were found inflammatory changes in the alimentary tract (in 3 animals), purulent pneumonia (in 4 animals) then contagious equine metritis, septicaemia, generalized pyemia and chronic ossificant myocarditis. In three foals no secondary infection was observed. As it was shown in the study, EVA in foals was frequently complicated by secondary bacterial infection making diagnosis difficult.