The editors Jeffrey J. Zimmerman, PhD, DVM, DACVPM is Professor of Disease Ecology in the Department of Veterinary Diagnostic and Production Animal Medicine at Iowa State University. Eric R. Burrough, PhD, DVM, is Professor and Diagnostic Pathologist in the Department of Veterinary Diagnostic and Production Animal Medicine at Iowa State University. Locke A. Karriker, DVM, MS, DACVPM is Morrill Professor of Veterinary Diagnostic and Production Animal Medicine and Director of the Swine Medicine Education Center at Iowa State University. Kent J. Schwartz, DVM, MS is Clinical Professor and Diagnostician in the Veterinary Diagnostic Laboratory at Iowa State University. Jianqiang Zhang, MD, PhD, is Professor and Virologist in the Department of Veterinary Diagnostic and Production Animal Medicine at Iowa State University.