1. Vaccinology Laboratory (Gómez-Romero, Basurto-Alcántara), Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Mexico City, Mexico
2. Molecular Microbiology Laboratory, Microbiology and Immunology Department (Verdugo-Rodríguez), Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Mexico City, Mexico
3. Ruminant Diseases and Immunology Research Unit, National Animal Disease Center/ARS/USDA, Ames, IA (Bauermann, Ridpath)