1. Department of Population Health and Reproduction, University of California, Davis, Davis, California, USA
2. Western Institute for Food Safety and Security, University of California, Davis, California, USA
3. College of Agriculture and Natural Resources, University of Wyoming, Laramie, Wyoming, USA
4. Department of Pathology, Microbiology, and Immunology, University of California, Davis, Davis, California, USA
5. California Animal Health and Food Safety Laboratory, Tulare Branch, University of California, Tulare, California, USA