1. National Institute of Agricultural Technology, Balcarce, Argentina
2. Instituto de Patología Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile
3. California Animal Health and Food Safety Laboratory System, San Bernardino, Laboratories, School of Veterinary Medicine, University of California–Davis, CA, USA
4. Davis, Laboratories, School of Veterinary Medicine, University of California–Davis, CA, USA