Anne M. Zajac, DVM, PhD, is Associate Professor in the Department of Biomedical Sciences and Pathobiology at Virginia-Maryland Regional College of Veterinary Medicine, Virginia Tech, Blacksburg, Virginia.
Gary A. Conboy, DVM, PhD, is Associate Professor in the Department of Pathobiology and Microbiology at Atlantic Veterinary College, University of Prince Edward Island, Charlottetown, Price Edward Island, Canada.