1. Department of Food Hygiene and Control, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt;
2. Graduate School of Agricultural Science, Hokkaido University, Sapporo, Japan;
3. Department of Pharmacology, Faculty of Veterinary Medicine, Kafrelsheikh University, Kafrelsheikh, Egypt;
4. Department of Infectious Diseases, Graduate School of Medicine, International University of Health and Welfare, Narita, Japan;
5. Department of Microbiology, Tokyo Medical University, Tokyo, Japan