1. College of Veterinary Medicine, 1365 Gortner Avenue St. Paul, MN 55108, USA
2. Department of Entomology, University of Minnesota, UGM, 219 Hodson Hall, 1980 Folwell Avenue, Saint Paul, MN 55108, USA
3. Department of Infectious Diseases and Immunology, College of Veterinary Medicine, University of Florida, Academic Building 1017, room V2-200, 1945 SW 16th Ave. Gainesville Fl, 32608, USA
4. Department of Veterinary Microbiology and Pathology, Washington State University, Grimes Way, Bustad Hall, room 402, P.O. Box 647040 Pullman, WA 99164-7040, USA