1. Exotic and Emerging Avian Viral Diseases Research Unit; Southeast Poultry Research Laboratory, US National Poultry Research Center, Agricultural Research Service, US Department of Agriculture; Athens Georgia USA
2. Istituto Zooprofilattico Sperimentale delle Venezie; Research and Innovation Department, OIE and National Reference Laboratory for Avian Influenza and Newcastle Disease, FAO Reference Centre for Animal Influenza and Newcastle Disease; Padova Italy