Authors
Krystyna Pohorecka
Department of Honey Bee Diseases, National Veterinary Research Institute, Pulawy, Poland
Marta Skubida
Department of Honey Bee Diseases, National Veterinary Research Institute, Pulawy, Poland
Andrzej Bober
Department of Honey Bee Diseases, National Veterinary Research Institute, Pulawy, Poland
Dagmara Zdańska
Department of Honey Bee Diseases, National Veterinary Research Institute, Pulawy, Poland