1. Department of Microbiology, Faculty of Veterinary Medicine, Ataturk University, Erzurum, Turkey.
2. Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA.
3. Department of Food Quality Control and Analysis, Erzurum Vocational School, Ataturk University, Erzurum, Turkey.
4. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA.