Editor-in-Chief: David E. Swayne is Laboratory Director of the Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, Agricultural Research Service, U.S. Department of Agriculture, in Athens, Georgia, USA. Associate Editors: Martine Boulianne is Professor in the Department of Clinical Sciences at the Faculty of Veterinary Medicine, University of Montreal, in St-Hyacinthe, Quebec, Canada. Catherine M. Logue is Professor in the Department of Population Health at the College of Veterinary Medicine, University of Georgia, in Athens, Georgia, USA. Larry R. McDougald is Emeritus Professor in the Department of Poultry Science at the College of Agricultural and Environmental Sciences, University of Georgia, in Athens, Georgia, USA. Venugopal Nair is Head of the Viral Oncogenesis Group at The Pirbright Institute in Woking, Surrey, UK. David L. Suarez is Research Leader of the Exotic and Emerging Avian Viral Diseases Research Unit, Southeast Poultry Research Laboratory, U.S. National Poultry Research Center, Agricultural Research Service, U.S. Department of Agriculture in Athens, Georgia, USA.