1. Wildlife Health Center, School of Veterinary Medicine, One Shields Avenue, University of California, Davis, California 95616, USA
2. Current address: San Francisco Zoo, One Zoo Road, San Francisco, California 94132, USA
3. California Department of Fish and Game, Wildlife Investigations Laboratory, 1701 Nimbus Road, Rancho Cordova, California 95670, USA
4. California Animal Health and Food Safety Laboratory System, School of Veterinary Medicine, PO Box 1770, Davis, California 95617, USA
5. California Department of Fish and Game, Wildlife Programs Branch, 1812 Ninth Street, Sacramento, California 95814, USA
6. Johnes Testing Center, School of Veterinary Medicine, University of Wisconsin, 2015 Linden Drive, Madison, Wisconsin 53706, USA