1. Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS, USA
2. Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, MO, USA
3. Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, Columbia, MO, USA
4. Division of Viral Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
5. Veterinary Medical Diagnostic Laboratory, College of Veterinary Medicine, University of Missouri, Columbia, MO, USA