Listeriosis is a serious infection that caused by eating foods contaminated with the Listeria monocytogenes (L. monocytogenes) bacterium. This infection is most likely to sicken pregnant women that may result in miscarriage, premature delivery, serious infection of the newborn or even stillbirth.
Listeriosis may also affect newborns, elderly, and adults with impaired immune systems. Healthy adults and children sometimes are infected with L. monocytogenes, but they rarely become seriously ill. Babies can be born with listeriosis if their mothers eat contaminated food during pregnancy.