1. 1Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
2. 2Division of Foodborne, Waterborne, and Environmental Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30333
3. 3Ohio Department of Health, Columbus, Ohio 43215
4. 4Outbreak Response, Columbus Public Health, Columbus, Ohio 43215
5. 5Michigan Department of Community Health, Bureau of Disease Control, Prevention, and Epidemiology, Lansing, Michigan 48933
6. 6Tennessee Department of Health, Foodborne, Vectorborne and Zoonotic Diseases, Nashville, Tennessee 37243, USA