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==Introduction==

==Introduction==

[[File:listeria 2.jpg|right|thumb|250px|<small><center>''Listeria monocytogenes'' (MarcoTolo 2006, Wikimedia commons)</center></small>]]

[[File:listeria 2.jpg|right|thumb|250px|<small><center>''Listeria monocytogenes'' (MarcoTolo 2006, Wikimedia commons)</center></small>]]

''Listeria monocytogenes'' is one of the six species belonging to the genus [[Listeria species - Overview|''Listeria'']].

''Listeria monocytogenes'' is one of the six species belonging to the genus [[Listeria species - Overview|''Listeria'']]. It is gram positive bacteria.

Outbreaks of [[Listeriosis|listeriosis]] are caused by ''L. monocytogenes''. The outbreaks are seasonal and linked to silage feeding.

Outbreaks of [[Listeriosis|listeriosis]] in the human population are caused by ''L. monocytogenes''. The outbreaks are seasonal and linked to silage feeding. In most cases, the symptoms are those of a mild gastroenteritis or gripe. However, people who belong to the high - risk groups (elderly, infants, pregnant women or people with immunosuppression) might develop more serious symptoms (invasive disease) caused by meningoencephalitis,  septicemia, miscarriage and mortality rate of approximately 30%.  

''Listeria monocytogenes'' replicates in poor quality silage, where the pH exceeds 5.5.  

''Listeria monocytogenes'' replicates in poor quality silage, where the pH exceeds 5.5.