1. Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, Washington.
2. The Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington.
3. College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina.
4. Egg Quality and Safety Research Unit, Agriculture Research Service, United States Department of Agriculture, Athens, Georgia.