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Department of Veterinary Pathobiology, College of Veterinary Medicine, 250 McElroy Hall, Oklahoma State University, Stillwater, OK 74078–2007, USA  Corresponding author.
PII: S0195-5616(04)00115-9 doi:10.1016/j.cvsm.2004.08.003 © 2005 Elsevier Inc. All rights reserved. | |
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