1. Department of Immunology, Microbiology and Physiological Chemistry; Faculty of Biotechnology and Animal Husbandry, West Pomeranian University of Technology; Szczecin, Doktora Judyma 24; 71-466
2. Department of Microbiology and Immunology; Pomeranian Medical University; Powstańców Wielkopolskich 72; 70-111; Szczecin; Poland