During the time period that the CDC Emergency Operations Center (EOC) was activated for this response (March 11 to April 18), there were 404 calls nationally regarding the Japan radiological incident. Three hundred and forty (84%) were calls requesting information about KI, iodide/iodine containing products or radiation associated with the Japan radiological incident. The remaining 64 calls (16%) were potential incidentrelated exposure calls. Of these, KI (n020), other iodidecontaining products (n017) and radiation (n 015) were reported most frequently. The number of information calls peaked on March 16 (n054), and the number of exposure calls peaked on March 17 (n09). Thirty-four (53%) of exposure calls were confirmed KI and iodide/iodine containing product exposures, 23 (36%) were calls regarding incident-related exposures, which were unable to be confirmed, and 7 (11%) were determined to be nonexposures.