1. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA.
2. Food Science and Technology, University of Nebraska Lincoln, Lincoln, NE 68588, USA.
3. Wisconsin National Primate Research Center, University of Wisconsin, Madison, WI 53703, USA.
4. Merck Animal Health, De Soto, KS 66018, USA.
5. Zoetis Inc., Global Biologics Research, Kalamazoo, MI 49007, USA.