Author: Kent J. Schwartz

Jeffrey J. Zimmerman, DVM, Ph D, DACVPM, is Professor of Disease Ecology in the Department of Veterinary Diagnostic and Production Animal Medicine at Iowa State University in Ames, Iowa. Locke Karriker, DVM, MS, DACVPM, is Associate Professorof Veterinary Diagnostic and Production Animal Medicine and Director of the Swine Medicine Education Center at Iowa State University in Ames, Iowa. Alejandro Ramirez, DVM, MPH, Ph D, DACVPM, is Assistant Professor of Veterinary Diagnostic and Production Animal Medicineat Iowa State University in Ames, Iowa. Kent J. Schwartz, DVM, MS, is Veterinary Diagnostician atthe Iowa State University Veterinary Diagnostic Laboratory in Ames, Iowa. Gregory W Stevenson, DVM, Ph D, DACVP, is Professor of Veterinary Pathology and Senior Diagnostic Veterinary Pathologistat Iowa State University in Ames, Iowa.