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[[File:listeria.jpg|right|thumb|250px|<small><center>Electron micrograph of Listeria monocytogenes. (Marco Tolo 2006, Wikimedia commons)</center></small>]]

[[File:listeria.jpg|right|thumb|250px|<small><center>Electron micrograph of ''Listeria monocytogenes''. (Marco Tolo 2006, Wikimedia commons)</center></small>]]

[[File:listeria 3.jpg|right|thumb|250px|<small><center>Listeria monocytogenes grown on Bio-Rad RAPID'L.Mono® Agar. (James Folsom 2007, Wikimedia commons)</center></small>]]

[[File:listeria 3.jpg|right|thumb|250px|<small><center>''Listeria monocytogenes'' grown on Bio-Rad RAPID'L.Mono® Agar. (James Folsom 2007, Wikimedia commons)</center></small>]]

==Overview==

==Overview==

   

   

''Listeria'' are intracellular pathogens. They are Gram positive rods with catalase positive and oxidase negative activity. They are facultative anaerobes and have tumbling motility.

''Listeria'' are intracellular pathogens. They are Gram positive rods with catalase positive and oxidase negative activity. They are facultative anaerobes and have tumbling motility.

[[Listeria monocytogenes|''L.monocytogenes'']] is haemolytic on blood agar due to a cytolytic protein, listeriolysin, and grows at range of pH values and temperatures. [[Listeria ivanovii|''L.ivanovii'']] produces a strong haemolytic zone. ''Listeria'' produces small, smooth, transparent colonies after 24 hours incubation. They are able to grow on non-enriched media.

[[Listeria monocytogenes|''L.monocytogenes'']] is haemolytic on blood agar due to a cytolytic protein, '''listeriolysin''', and grows at range of pH values and temperatures. [[Listeria ivanovii|''L.ivanovii'']] produces a strong haemolytic zone. ''Listeria'' produces small, smooth, transparent colonies after 24 hours incubation. They are able to grow on non-enriched media.

==Pathogenesis and pathogenicity==

==Pathogenesis and pathogenicity==