1. Global Immunization Division, Centers for Disease Control and Prevention, Atlanta, Georgia;
2. National Public Health Laboratory, Ministry of Public Health and Population, Port-au-Prince, Haiti;
3. Oak Ridge Institute for Science and Education, Centers for Disease Control and Prevention, Atlanta, Georgia;
4. Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia;
5. Pan American Health Organization, Washington, District of Columbia;
6. Directorate of Epidemiology, Laboratory and Research, Ministry of Public Health and Population, Port-au-Prince, Haiti;
7. Expanded Program on Immunization, Ministry of Public Health and Population, Port-au-Prince, Haiti;
8. Centers for Disease Control and Prevention, Port-au-Prince, Haiti;
9. Institut Haitien de l’Enfance, Pétion-Ville, Haiti;
10. Division of Foodborne, Waterborne, and Environmental Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia