A multistate outbreak of Listeria monocytogenes infections was investigated using a standard questionnaire. Cases all shared the same strain of Listeria monocytogenes. Cases were more likely than controls to have eaten turkey deli meat. Product traceback was initiated by the involved states and led to multiple turkey processing plants. No particular brand or process date could be identified so no product was recalled. Turkey deli meat had been identified as a source of Listeriosis in previous outbreaks, and it likely was the vehicle in this outbreak.