Many 911 calls were reported from the shelter of interest. While medical information was vague, additional details enabled ACDC to match one call to a confirmed case. Follow-up for diagnosis information is possible when ED transportation information is present. Precise caller locations make 911 calls particularly useful for investigations with a strong emphasis on location such as point source outbreaks. Querying preestablished ED visit, coroner death, and 911 call feeds can provide a relatively quick supplement to traditional outbreak investigations.