Listeria is a bacterium which is not capable of forming endospores. Only two species are of human pathogenic significance: L. monocytogenes and L. ivanovii. L. monocytogenes have been implicated in several food poisoning epidemics. It lives in the gastrointestinal tract and in animal feces. People who are infected suffered from vomiting, nausea, and diarrhea. Newborns, pregnant women and their fetuses, the elderly, and persons lacking a healthy immune system are the most susceptible. It also causes listeriosis which is an inflammation of the brain. Antibiotics are used for treatment of infection because most strains of Listeria are sensitive to ampicillin and gentamicin.

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