1. County Veterinary Inspectorate, Stanisława Dubois 3, 46-100 Namyslow, Poland
2. Institute of Veterinary Medicine, Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Torun, Poland
3. Department of Swine Diseases, National veterinary Research Institute, Partyzanotw 57 Avenue, 24-100 Pulawy, Poland
4. Academia Copernicana Interdisciplinary Doctoral School, Bojarskiego 1, 87-100 Torun, Poland
5. Department of Infectious, Invasive Diseases and Veterinary Administration, Institute of Veterinary Medicine, Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Torun, Poland