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Listeria is a bacterial genus containing six species. Named after the English pioneer of sterile surgery Joseph Lister, the genus was given its current name in 1940. Listeria species are Gram-positive bacilli and are typified by L. monocytogenes, the causative agent of listeriosis.

Listeria ivanovii is a pathogen of ruminants, and can infect mice in the laboratory, although it is only rarely the cause of human disease.
Listeria monocytogenes
Listeria monocytogenes is

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