1. Epidemic Intelligence Service, Center for Surveillance, Epidemiology, and Laboratory Services, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
2. Enteric Diseases Epidemiology Branch, Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
3. Massachusetts Department of Public Health, Bureau of Infectious Disease and Laboratory Sciences, Boston, Massachusetts, USA
4. Brigham and Women’s Hospital, Division of Infectious Diseases, Boston, Massachusetts, USA
5. New Jersey Department of Health, Communicable Disease Service, Trenton, New Jersey, USA
6. Rhode Island Department of Health, Center for Acute Infectious Disease Epidemiology, Providence, Rhode Island, USA
7. Brown Medicine, Division of Infectious Diseases, Providence, Rhode Island, USA
8. Tennessee Department of Health, Communicable and Environmental Diseases and Emergency Preparedness, Nashville, Tennessee, USA
9. Enteric Diseases Laboratory Branch, Division of Foodborne, Waterborne, and Environmental Diseases, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA