1. Department of Pathology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma;, Email: wendytuttle@gmail.com
2. Departments of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, Colorado
3. University of Queensland, Australian Infectious Diseases Research Centre, St Lucia, and School of Veterinary Science, Gatton Campus, Queensland, Australia
4. Department of Clinical Sciences, Colorado State University, Fort Collins, Colorado