1. Department of Virology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
2. Institut für Virologie, Robert von Ostertag-Haus, Zentrum für Infektionsmedizin, Freie Universität Berlin, 14163 Berlin, Germany
3. Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
4. Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
5. Department of Biology and Marine Biology, University of North Carolina Wilmington, Wilmington, NC 28403, USA