Affiliation: | (1) Veterinary Medical Research Institute, College of Veterinary Medicine, Iowa State University, 50011 Ames, IA, U.S.A.;(2) Department of Microbiology, Immunology and Preventive Medicine, College of Veterinary Medicine, Iowa State University, 50011 Ames, IA, U.S.A.;(3) Department of Large Animal Clinical Sciences, Veterinary Clinical Center, Michigan State University, 48824 East Lansing, MI, U.S.A. |