1. Laboratory Animal Sciences Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Bethesda, Maryland;, Email: matthew.breed@nih.gov
2. Salem Animal Hospital, Salem, Virginia; National Institutes of Health, Bethesda, Maryland
3. Laboratory of Bacteriology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland
4. Centre for Public Health and Zoonoses, Department of Pathobiology, University of Guelph, Guelph, Ontario, Canada; National Institutes of Health, Bethesda, Maryland
5. Statistical Consulting, Data Management Services, Inc., Frederick National Laboratory for Cancer Research, Frederick, Maryland
6. Division of Veterinary Resources, National Institutes of Health, Bethesda, Maryland
7. Laboratory Animal Sciences Program, Leidos Biomedical Research, Inc., Frederick National Laboratory for Cancer Research, Bethesda, Maryland