1. Department of Physiology, Laboratory of Animal Microbiology, Institute of Animal Physiology, Centre of Biosciences of the Slovak Academy of Sciences, Košice, Slovakia.
2. Department of Epizootology, Clinical Diagnostic and DDD, Scientific Veterinary Institute, Novi Sad, Republic of Serbia.
3. Departmet of Microbiology and Immunology, University of Veterinary Medicine and Pharmacy in Košice, Slovakia.