1. Department of Veterinary Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, 1 Shields Avenue, Davis, California 95616, USA
2. California Animal Health and Food Safety Laboratory System, Davis Branch, University of California, Davis, 1 Shields Avenue, Davis, California 95616, USA
3. Wildlife Investigations Lab, California Department of Fish and Wildlife, 1701 Nimbus Road Suite D, Rancho Cordova, California 95670, USA
4. California Department of Fish and Wildlife, 407 W Line Street, Bishop, California 93514, USA
5. Current address: Los Angeles Department of Water and Power, 300 Mandich Street, Bishop, California 93514, USA