Authors
Grzegorz Woźniakowski
grzegorz.wozniakowski@piwet.pulawy.pl
Department of Swine Diseases, National Veterinary Research Institute, Pulawy, Poland
Maciej Frant
Department of Swine Diseases, National Veterinary Research Institute, Pulawy, Poland
Andrzej Mamczur
Avi-Vet Service, Mamczur J., Szeptycki S.J., Tarnowo Podgórne, Poland