1. Department of Pathobiology, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, Illinois, USA
2. Department of Infectious Diseases, University of Georgia, Athens, Georgia, USA
3. Institute of Traditional Chinese Veterinary Medicine, MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China
4. Pathobiology Department, School of Veterinary Medicine, St. George’s University, Grenada, West Indies