Difference between revisions of "Listeria monocytogenes"

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(Created page with '*Outbreaks of listeriosis caused by ''L. monocytogenes'' seasonal and linked to silage feeding *Replicates in poor quality silage where the pH excedes 5.5 *Animals highly suscept…')
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{{Taxobox
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*Outbreaks of listeriosis caused by ''L. monocytogenes'' seasonal and linked to silage feeding
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|name              =''Listeria monocytogenes''
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*Replicates in poor quality silage where the pH excedes 5.5
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|phylum            =Firmicutes
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*Animals highly susceptible during pregnancy due to lowered cell-mediated immunity
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|class              =Bacilli
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*Neural listeriosis:
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|order              =Bacillales
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**Incubation period 14-40 days
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|family            =Listeriaceae
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**Meningoencephalitis
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|genus              =[[:Category:Listeria species|Listeria]]
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**Dullness, circling, head tilt, facial paralysis, drool saliva, droop of eyelid and ear
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|species            =''L.monocytogenes''
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**Exposure keratitis
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}}
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**Fever during early stages
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==Introduction==
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**Recumbency and death within a few days in sheep and goats
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[[File:listeria 2.jpg|right|thumb|250px|<small><center>''Listeria monocytogenes'' (MarcoTolo 2006, Wikimedia commons)</center></small>]]
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**Abortion up to 12 days after infection in cattle; usually recover but may get septicaemia
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''Listeria monocytogenes'' is one of the six species belonging to the genus [[Listeria species - Overview|''Listeria'']]. It is gram positive bacteria.
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*Septicaemic listeriosis:
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**Incubation period 2-3 days
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**Lambs and occasionally pregnant sheep
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**Occurs in newborn piglets, foals, poultry, adult sheep
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*Keratoconjunctivitis in cattle and sheep - direct contact with silage via eye
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*Pneumonia, myocarditis, enodcarditis
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*Zoonosis - consumption of contaminated unpasteurised milk; memingitis and meningoencephalitis; abortion
  
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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%.
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[[Category:Listeria species]][[Category:Sheep]][[Category:Pig]][[Category:Horse]]
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''Listeria monocytogenes'' replicates in poor quality silage, where the pH exceeds 5.5.
 
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Animals are highly susceptible during pregnancy due to lowered cell-mediated immunity.
 
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{{Learning
 
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|literature search = [http://www.cabdirect.org/search.html?q=title%3A%28%22Listeria+monocytogenes%22%29+AND+od%3A%28cattle%29  ''Listeria monocytogenes'' cattle publications]
 
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[http://www.cabdirect.org/search.html?q=title%3A%28%22Listeria+monocytogenes%22%29+AND+od%3A%28sheep%29 ''Listeria monocytogenes'' in sheep publications]
 
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[http://www.cabdirect.org/search.html?q=title%3A%28%22Listeria+monocytogenes%22%29+AND+od%3A%28goats%29 ''Listeria monocytogenes'' in goats publications]
 
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[http://www.cabdirect.org/search.html?q=title%3A%28%22Listeria+monocytogenes%22%29+AND+od%3A%28dogs%29 ''Listeria monocytogenes'' in dogs publications]
 
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[http://www.cabdirect.org/search.html?q=title%3A%28%22Listeria+monocytogenes%22%29+AND+od%3A%28cats%29 ''Listeria monocytogenes'' in cats publications]
 
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[http://www.cabdirect.org/search.html?q=title%3A%28%22Listeria+monocytogenes%22%29+AND+od%3A%28horses%29 ''Listeria monocytogenes'' in horses publications]
 
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}}
 
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[[Category:Listeria species]]
 

Revision as of 10:26, 14 May 2010

  • Outbreaks of listeriosis caused by L. monocytogenes seasonal and linked to silage feeding
  • Replicates in poor quality silage where the pH excedes 5.5
  • Animals highly susceptible during pregnancy due to lowered cell-mediated immunity
  • Neural listeriosis:
    • Incubation period 14-40 days
    • Meningoencephalitis
    • Dullness, circling, head tilt, facial paralysis, drool saliva, droop of eyelid and ear
    • Exposure keratitis
    • Fever during early stages
    • Recumbency and death within a few days in sheep and goats
    • Abortion up to 12 days after infection in cattle; usually recover but may get septicaemia
  • Septicaemic listeriosis:
    • Incubation period 2-3 days
    • Lambs and occasionally pregnant sheep
    • Occurs in newborn piglets, foals, poultry, adult sheep
  • Keratoconjunctivitis in cattle and sheep - direct contact with silage via eye
  • Pneumonia, myocarditis, enodcarditis
  • Zoonosis - consumption of contaminated unpasteurised milk; memingitis and meningoencephalitis; abortion
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