1 Chesley L. Richards is Director of the Office of Public Health Scientific Services at CDC in Atlanta, Georgia. Michael F. Iademarco is Director of the Center for Surveillance, Epidemiology, and Laboratory Services at CDC and an Officer with the Commissioned Corps of the U.S. Public Health Service (USPHS) in Atlanta. Tara C. Anderson is an Epidemiology Practicum Fellow at the Center for Surveillance, Epidemiology, and Laboratory Services at CDC and an Officer with the Commissioned Corps of the USPHS.