1. Laboratory of Molecular, Cellular, and Environmental Rickettsiology, Department of Veterinary Biosciences, College of Veterinary Medicine, Infectious Diseases Institute, The Ohio State University, Columbus, Ohio, USA
2. Veterinary Clinical Sciences, The Ohio State University, Columbus, Ohio, USA
3. Moore Equine Veterinary Centre, Rocky View County, Alberta, Canada
4. Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Montréal, St. Hyacinthe, Québec, Canada
5. Service Vétérinaire Ambulatoire, St-Lazare, Québec, Canada
6. Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada