A new, unique event code was created for staff of all 57 regional PCs to use for coding calls related to this incident. This enabled CDC and AAPCC to track incident-related information requests and exposure calls using NPDS. Calls involving either information requests or reported exposures to radiation, potassium iodide and other iodide-containing products were identified, reviewed and tabulated daily. For each exposure call, individual PCs were then contacted by AAPCC officials to obtain additional data not uploaded to NPDS. CDC epidemiologists and toxicologists reviewed these data daily using set criteria to determine if a true exposure had occurred. Aggregate NPDS data were reported daily to CDC's Emergency Operations Center leadership to enhance situational awareness.