1. California Department of Public Health, Vector-Borne Disease Section, 850 Marina Parkway, Richmond, California 94804, USA
2. Center for Vectorborne Diseases, Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, VetMed3A, Room 5329, University of California, Davis, California 95616, USA
3. California Department of Public Health, Vector-Borne Disease Section, 1616 Capitol Avenue, MS-7307, PO Box 997377, Sacramento, California 95899, USA
4. California Department of Public Health, Vector-Borne Disease Section, 8633 Bond Road, Elk Grove, California 95624, USA