1. Department of Veterinary Science, M. H. Gluck Equine Research Center, University of Kentucky, Lexington, Kentucky, USA
2. Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota, USA
3. Zuckerman Mind Brian Behavior Institute, Columbia University, New York, New York, USA
4. Department of Veterinary and Biomedical Sciences, South Dakota State University, Brookings, South Dakota, USA
5. Virology Section, Victorian Infectious Diseases Reference Laboratory, Melbourne, Victoria, Australia
6. Nebraska Center for Virology, University of Nebraska—Lincoln, Lincoln, Nebraska, USA
7. School of Biological Sciences, University of Nebraska—Lincoln, Lincoln, Nebraska, USA