1. Epidemic Intelligence Service; Scientific Education and Professional Development Program Office; Office of Surveillance, Epidemiology, and Laboratory Services; Centers for Disease Control and Prevention, Atlanta, Georgia.
2. Wisconsin Division of Public Health, Madison, Wisconsin.
3. National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia.
4. Wisconsin State Laboratory of Hygiene, Madison, Wisconsin.
5. Animal and Plant Health Inspection Service, U.S. Department of Agriculture, Raleigh, North Carolina.
6. Pennsylvania Department of Health, Harrisburg, Pennsylvania.
7. Waukesha County Health and Human Services Department, Public Health Division, Waukesha, Wisconsin.