L. monocytogenes is one of the most virulent food-borne pathogens. It is the third-most-common cause of meningitis in newborns. When the infection is not invasive, any illness as a consequence of infection is termed febrile gastroenteritis. The manifestations of listeriosis include septicaemia, meningitis, encephalitis, corneal ulcer, pneumonia, and intrauterine infections in pregnant women, which may result in abortion or stillbirth. Surviving neonates of fetomaternal listeriosis may suffer granulomatosis infantiseptica and may suffer from physical retardation. Influenza-like symptoms, including persistent fever, usually precede the onset of the disorders.