1. 1California Department of Public Health, Division of Communicable Disease Control, Infectious Diseases Branch, 850 Marina Bay Parkway, Richmond, California 94804
2. 2U.S. Department of Agriculture, Food Safety and Inspection Service, 1616 Capitol Avenue, Suite 260, Omaha, Nebraska 68102
3. 3Arizona Department of Health Services, Bureau of Epidemiology and Disease Control Services, Office of Infectious Disease Services, 150 North 18th Avenue, Phoenix, Arizona 85007
4. 4California Emerging Infections Program, 1611 Telegraph Avenue, Suite 1200, Oakland, California 94612
5. 5Centers for Disease Control and Prevention, National Center for Zoonotic, Vector-Borne, and Enteric Diseases, 1600 Clifton Road, Atlanta, Georgia 30333, USA