1. Department of Food Hygiene and Aquaculture, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
2. German Federal Institute for Risk Assessment, Department Biological Safety, Berlin, Germany
3. Department of Microbiology and Virology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
4. Central Facility for Microscopy, Helmholtz Centre for Infection Research GmbH, Braunschweig, Germany
5. Institute for Veterinary Food Science, Justus-Liebig-University Giessen, Giessen, Germany
6. University of Veterinary Medicine Hannover, Foundation, Institute for Food Quality and Food Safety, Hannover, Germany