Symptoms | Listeria | CDC
www.cdc.gov › listeria › symptomsMay 03, 2022 · Signs and symptoms of Listeria infection vary depending on the person infected and the part of the body affected. The bacteria are most likely to sicken people who are pregnant and their newborns, adults aged 65 or older, and people with weakened immune systems. Other people can be infected with Listeria, but they rarely become seriously ill.