1. Hygiene and Zoonoses Department, Faculty of Veterinary Medicine Mansoura University Mansoura Egypt
2. Institute for Animal Nutrition University of Veterinary Medicine Hannover Foundation Hannover Germany
3. Institute of Hygiene and Infectious Diseases of Animals Justus-Liebig-University Gießen Gießen Germany
4. Institute of Food Quality and Food Safety University of Veterinary Medicine Hannover Hannover Germany