1 Department of Pathology, Microbiology, and Immunology, University of California-Davis, Davis, CA, USA.
2 California Animal Health and Food Safety Laboratory, San Bernardino Branch, University of California-Davis, Davis, CA, USA.
3 National Institute for Agrarian and Veterinary Research (INIAV), Oeiras, Portugal and Faculty of Veterinary Medicine, Lusofona University, Lisboa, Portugal.
4 Comparative Pathology Laboratory, University of California-Davis, Davis, CA, USA.