1. Department of Microbiology and Immunology, Montana State University, Bozeman, MT, USA
2. Center for the Ecology of Infectious Diseases, University of Georgia, Athens, GA, USA
3. Department of Biology, Indiana University, Bloomington, IN, USA
4. Veterinary Microbiology and Pathology, Washington State University College of Veterinary Medicine, Bozeman, MT, USA
5. Emmett Interdisciplinary Program in Environment and Resources, Stanford University, Stanford, CA, USA