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1. Batista, DVM,S. A. Dee, DVM, MS, PhD,DipACVM,M. Olin, BS,T. W. Molitor, MS, PhD,H. S. Joo, DVM, PhD,C. Pijoan, DVM, PhD,Swine Disease EradicationCenter, Room 385C,University of MinnesotaCollege of VeterinaryMedicine, 1988 FitchAvenue, St Paul,MN 55108, USAK. D. Rossow, DVM, PhD,Minnesota VeterinaryDiagnostic Laboratory,1333 Gortner Avenue,St Paul, MN 55108, USAD. D. Polson, DVM, MS,PhD,Boeheringer lngelheimVetmedica 2501, NorthLoop Drive 1000, Ames,IA 50010, USAZ. Xiao, DVM,M. P. Murtaugh, PhD,Department of VeterinaryPathobiology, Universityof Minnesota College ofVeterinary Medicine, 1971Commonwealth Avenue,St Paul, MN 55108, USACorrespondence toProfessor Dee