Springfield Smoked Fish of Springfield, MA is expanding their voluntary recall of smoked fish products because they have the potential to be contaminated with Listeria monocytogenes, an organism which can cause serious infections in young children, frail or elderly people, and others with weakened immune systems. Although healthy individuals may suffer only short-term symptoms such as high fever, severe headache, stiffness, nausea, abdominal pain and diarrhea, Listeria infection can cause miscarriages and stillbirths among pregnant women.