1. US Geological Survey, National Wildlife Health Center, Honolulu Field Station, 300 Ala Moana Blvd., Room 8-132, Honolulu, Hawaii 96850, USA
2. Poultry Diagnostics and Research Center, University of Georgia, 953 College Station Rd., Athens, Georgia 30602, USA
3. US Geological Survey, National Wildlife Health Center, 6006 Schroeder Rd., Madison, Wisconsin 53711, USA
4. Department of Microbiology & Immunology, School of Veterinary Medicine, 602 Tower Rd., Ithaca, New York 14853, USA