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| {{Taxobox
| | #redirect [[Listeria]] |
| | image = 0041261239.jpg
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| | regnum = [[Bacteria]]
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| | divisio = [[Firmicutes]]
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| | classis = [[Bacilli]]
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| | ordo = [[Bacillales]]
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| | familia = [[Listeriaceae]]
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| | genus = ''[[Listeria]]''
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| | species = '''''L. ivanovii'''''
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| | binomial = ''Listeria ivanovii''
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| | binomial_authority = Seeliger ''et al''.
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| }}
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| __NOTOC__
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| {{SI}}
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| {{Seealso|Listeriosis}}
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| {{CMG}}
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| ==Overview==
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| '''''Listeria ivanovii''''' is a species of [[bacteria]] in the genus ''[[Listeria]]''. The listeria are [[rod-shaped bacteria]] and become [[Gram-positive bacteria|positively stained]] when subjected to [[Gram staining]]. Of the six bacteria species within the genus, ''L. ivanovii'' is one of the two [[pathogenic]] species (the other being ''[[L. monocytogenes]]'').<ref>{{cite book|last=Pallen|first=Mark J.|title=Bacterial Pathogenomics|year=2007|publisher=ASM Press|location=Washington, DC, USA|isbn=9781555814519|page=361}}</ref> It behaves like ''Listeria monocytogenes'', but is found almost exclusively in [[ruminant]]s (mainly sheep).<ref name="Guillet 2010">{{cite journal |author=Christelle Guillet, Olivier Join-Lambert, Alban Le Monnier, Alexandre Leclercq, Frédéric Mechaï, Marie-France Mamzer-Bruneel, Magdalena K. Bielecka, Mariela Scortti, Olivier Disson, Patrick Berche, José Vazquez-Boland, Olivier Lortholary & Marc Lecuit |year=2010 |title=Human listeriosis caused by ''Listeria ivanovii'' |journal=[[Emerging Infectious Diseases]] |volume=16 |issue=1 |pages=136–138 |doi=10.3201/eid1601.091155 |url=http://wwwnc.cdc.gov/eid/article/16/1/pdfs/09-1155.pdf |format=[[Portable Document Format|PDF]] |pmid=20031061 |pmc=2874378}}</ref> The species is named in honor of [[Bulgaria]]n [[Microbiology|microbiologist]] Ivan Ivanov.<ref name="Seeliger 1984">{{cite journal |author=Seeliger HPR, Rocourt J, Schrettenbrunner A, Grimont PAD, Jones D. |title=''Listeria ivanovii'' sp. nov. |journal=International Journal of Systematic Bacteriology |year=1984 |volume=34 |issue=3 |pages=336–7 |url=http://ijs.sgmjournals.org/content/34/3/336.full.pdf |format=PDF}}</ref>
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| ==Distinction==
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| ''L. ivanovii'' can be distinguished from ''[[L. monocytogenes]]'' and other Listeria species by culturing it on sheep or horse blood [[Agar plate#Types|agar]], which will produce a wide, clear or double zone of [[hemolysis]], producing a so-called positive [[CAMP test|Christie-Atkins-Munch-Petersen (CAMP) reaction]] with ''[[Rhodococcus equi]]'' but not with hemolytic ''[[Staphylococcus aureus]]''.<ref>[http://jmm.sgmjournals.org/content/55/6/645.full Identification, subtyping and virulence determination of Listeria monocytogenes on the Journal of Medical Microbiology website]</ref>
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| ==Pathology==
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| Infection with ''L. ivanovii'' can lead to [[Sepsis|septicemic]] disease with [[enteritis]], neonatal [[sepsis]] and even [[abortion]].<ref>[http://www.ncbi.nlm.nih.gov/pubmed/9791184 PMID 9791184 Engelbrecht et al.] on the [[PubMed]] website</ref> Pregnant ruminants are therefore most at risk.
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| ==Human infection==
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| In January 2007, a 55-year old man was hospitalized in [[Paris]], [[France]]. After examination he was thought to have [[listeriosis]]. Both blood and [[feces|stool]] samples were taken. ''L. ivanovii'' was identified, thus characterizing the species as an enteric [[Opportunism#Biological opportunism|opportunistic]] human [[pathogen]]. As ''L. ivanovii'' is usually only found in ruminants and human infection is extremely rare, this infection can be seen as a form of [[zoonosis]].
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| ==Treatment==
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| If diagnosed early, antibiotics can be effective. Antibiotics effective against ''Listeria'' species include [[ampicillin]], [[vancomycin]], [[ciprofloxacin]] and [[azithromycin]]. Early diagnosis is uncommon because infection is not usually accompanied by symptoms.
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| ==References==
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| {{Reflist|2}}
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| ==External links==
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| * [http://microbewiki.kenyon.edu/index.php/Listeria_ivanovii Listeria ivanovii on the MicrobeWiki of Kenyon Biology] part of [[Kenyon College]]
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| * [http://textbookofbacteriology.net/themicrobialworld/Listeria.html Listeria in the textbook of bacteriology] on the Department of Bacteriology of the [[University of Wisconsin–Madison]] website
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| [[Category:Listeriaceae]]
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