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This study was supported by the American Animal Hospital Association, the Association of American Veterinary Medical Colleges, the American Veterinary Medical Association, the Centers for Disease Control and Prevention under Contract No. 200-2000-00629 (Task Order No. 28), the National Association of Federal Veterinarians, and the National Center for Research Resources and the National Institute of Environmental Health Sciences of the National Institutes of Health under Contract No. N01-OD-4-2139 (Task Order No. 140). Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the project.
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