Authors
I. Simeonova
Department of Hygiene, Epidemiology, Microbiology, Parasitology and Infectious Diseases, Faculty of Medicine, Trakia University – Stara Zagora, Bulgaria
I. Mladenova
Department of Hygiene, Epidemiology, Microbiology, Parasitology and Infectious Diseases, Faculty of Medicine, Trakia University – Stara Zagora, Bulgaria
D. Petrov
Faculty of Medicine, Trakia University – Stara Zagora, Bulgaria
