1. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;
2. Idaho Department of Health and Welfare, Boise, Idaho, USA;
3. Minnesota Department of Health, Minneapolis, Minnesota, USA;
4. Minnesota Department of Health, Minneapolis, Minnesota, USA;Current affiliation: University of Minnesota, St. Paul, Minnesota, USA.
5. University of Minnesota, St. Paul, Minnesota, USA;Current affiliation: 3M Pharmaceuticals, St. Paul, Minnesota, USA.
6. Washington Department of Health, Olympia, Washington, USA;Current affiliation: US Department of Agriculture, Olympia, Washington, USA.
7. Washington State University, Pullman, Washington, USA;Current affiliation: New York State Department of Agriculture, Albany, New York, USA.
8. Chambers Creek Veterinary Hospital, Lakewood, Washington, USA;
9. The Gene Poole Memorial Cat Clinic, Bellingham, Washington, USA
10. Centers for Disease Control and Prevention, Atlanta, Georgia, USA;Current affiliation: New York University School of Medicine, New York, New York, USA.
11. Washington State University, Pullman, Washington, USA;