1. Department of Basic Biomedical Sciences, University of South Dakota School of Medicine, Vermillion, South Dakota
2. Department of Microbiology and Immunology, University of North Dakota School of Medicine, Grand Forks, North Dakota
3. Department of Diagnostic Medicine and Pathobiology, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas
4. Department of Microbiology, School of Medicine, University of Minnesota, Minneapolis, Minnesota