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(Section Editor Barr

Stephen C. Barr , BVSc, MVS, PhD, DipACVIM (SA), is Professor of Medicine, Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY. Dwight D. Bowman , MS, PhD, is Professor of Parasitology, Department of Microbiology and Parasitology, Cornell University, Ithaca, NY.