1. Department of Natural Resources and the Environment, Cornell University, Fernow Hall, 226 Mann Dr., Ithaca, New York 14853, USA
2. College of Veterinary Medicine, Cornell University, 602 Tower Rd., Ithaca, New York 14853, USA
3. Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, 930 Campus Rd., Ithaca, New York 14853, USA
4. Ventura County Animal Services, 600 Aviation Dr., Camarillo, California 93010, USA
5. Center of Excellence for Vaccine Research, Department of Pathobiology and Veterinary Science, University of Connecticut, 61 N Eagleville Rd., Storrs, Connecticut 06269, USA
6. Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Rd., Ithaca, New York 14850, USA