 Investigators say the outbreak does not affect prepackaged deli meat. No recalls have been made yet as the investigation is ongoing. More than two dozen people have been hospitalized across 12 states. New York had the highest number of serious cases with seven hospitalized. Listeria is a foodborne bacterial illness that affects around 1,600 people in the U.S. every year with about 260 deaths. Rebecca Rossman, NPR News.