1. Charles River Laboratories, Pathology, 251 Ballardvale Street, Wilmington, Massachusetts 01887, USA
2. Cornell Laboratory of Ornithology, Cornell University, 159 Sapsucker Woods Road, Ithaca, New York 14850, USA
3. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, 240 Farrier Road, Long Island University, 720 Northern Boulevard, Brookville, New York 11548, USA
4. Department of Microbiology and Immunology, Cornell University, 240 Farrier Road, Ithaca, New York 14853, USA
5. College of Veterinary Medicine, Department of Biomedical Sciences, 240 Farrier Road, Cornell University, Ithaca, New York 14853, USA
6. Department of Veterinary Biomedical Sciences, College of Veterinary Medicine, Long Island University, 720 Northern Boulevard, Brookville, New York 11548, USA