[Encephalitozoonosis in farm-bred arctic blue foxes (Alopex lagopus)].

Occurrence of encephalitozoonosis in farm breeding of blue fox is described. Fifty youngs of eight breeding females were infected, mortality was 88%. The main clinical symptoms of the disease were somnolence, ataxia, vision disorders, clonic spasms, at a protracted course also retarded growth. Typical nonpurulent microgranulomata with occurrence of individual spores and cysts of Encephalitozoon cuniculi were demonstrated in liver and central nervous system. Further, diffusion interstitial nephritis and necrotizing angiitis were determined. In breeding females, chronical interstitial nephritis was determined, without detection of the causative agent. A probable source of infection was the feeding of dead rabbits with subsequent transmission to progeny.