1. National Wildlife Research Center, Wildlife Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, 4101 LaPorte Ave., Fort Collins, Colorado 80521-2154, USA
2. Veterinary Public Health Section, California Department of Health Services, 1600 Capitol Ave., Sacramento, California 95814, USA
3. Santa Barbara County Public Health Department, 345 Camino del Remedio, Santa Barbara, California 93110, USA
4. Centers for Disease Control and Prevention, 1600 Clifton Rd., Atlanta, Georgia 30329-4018, USA
5. Wildlife Services, Animal and Plant Health Inspection Service, United States Department of Agriculture, 59 Chenell Dr., Concord, New Hampshire 03301-8548, USA