1. Department of Veterinary Microbiology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa.
2. Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, Minnesota.
3. Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, North Dakota.
4. Veterans Affairs Medical Center, University of Minnesota, Minneapolis, Minnesota.
5. Poultry Health Management Team, Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina.
6. Wiley Lab, Gastroenteric Disease Center, The Pennsylvania State University, University Park, Pennsylvania.
7. Department of Obstetrics and Gynecology, University of Tsukuba, Tsukuba, Japan.
8. Netherlands Reference Laboratory for Bacterial Meningitis, Department of Medical Microbiology, Academic Medical Center, Amsterdam, The Netherlands.