Authors
Grzegorz Woźniakowski
Department of Swine Diseases, Puławy, Poland
Marek Walczak
Department of Swine Diseases, Puławy, Poland
Małgorzata Juszkiewicz
Department of Swine Diseases, Puławy, Poland
Maciej Frant
Department of Swine Diseases, Puławy, Poland
Krzysztof Niemczuk
Director General National Veterinary Research Institute, Puławy, Poland