1. Department of Pathobiology, College of Veterinary Medicine, Auburn University, Auburn, AL
2. Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC
3. Antech Diagnostics, Los Angeles, CA
4. Laboratório de Patologia Veterinária, Faculdade de Medicina Veterinária, Universidade Federal do Mato Grosso, Boa Esperança, Cuiabá, Brazil