1. Department of Small Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA 30602
2. International Escherichia and Klebsiella Reference Centre, Statens Serum Institut, Copenhagen, Denmark
3. Athens Diagnostic Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA 30602
4. Department of Pathology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602