Authors
Małgorzata Juszkiewicz
malgorzata.juszkiewicz@piwet.pulawy.pl
Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland
Marek Walczak
Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland
Grzegorz Woźniakowski
Department of Swine Diseases, National Veterinary Research Institute, Puławy, Poland