 went down near the Youngstown Warren Regional Airport Friday evening while attempting to make an emergency landing. The NTSB will investigate. An outbreak of listeria has U.S. health officials advising people who are pregnant, elderly, or have compromised immune systems to avoid eating sliced deli meat. The warning from the CDC comes as investigators work to identify the specific products involved in this listeria outbreak. At least 28 people have been hospitalized across 12 states.