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Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Listeria innocua
Category: Motile
Etymology: Genus name: named after the British surgeon Lord Lister.
Species epithet: harmless.
Significance:Can be found as a contaminant of food, but can easily be differentiated from L. monocytogenes by cultivation on OCLA-agar. See L. monocytogenes.
  [Of minor importance]   
Taxonomy:
Phylum
Firmicutes
Class
Bacilli
Order
Bacillales
Family
Listeriaceae 
Genus
Listeria
Type Strain: ATCC 33090 = CCUG 15531 = NCTC 11288.
Macromorphology (smell): No hemolysis on blood agar.
Micromorphology: Motile rod (0.4-0.5 x 1-2 µm). Has a few peritrichous flagella.
Gram +/Gram -:G+
Metabolism: Facultatively anaerobic.
Catalase/Oxidase:+/-
Other Enzymes: Esculinase +, lecithinase -, hippuricase +, tryptophanase - and urease -.
Biochemical Tests: Methyl red +, Voges-Proskauer +.
Fermentation of carbohydrates:
D-glucoselactosemaltoseL-rhamnosesucrose
++?v+
L-arabinosecellobioseD-mannitolsalicintrehalose
-?-?+
glycerolinulinraffinoseD-sorbitolstarch
+??--
Other carbohydrates: Galactose -, ribose -, D-xylitol +, D-xylose -.
Spec. Char.:
Reservoir: The environment (soil, water etc.).
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_003212 Clip11262 3 011 208 1c + 1c 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperonSequence similarity
X98527 ATCC33090T 1 404 99,8 - 100% 

Taxonomy/phylogeny:
 
There are 21 species and subspecies described within the genus and all are very similar. L. innocua and L. monocytogenes have almost identical 16S rRNA sequences.
Updated:2015-11-27

News

The revised taxonomy of the mollicutes

The revised taxonomy of mollicutes (mycoplasmas) has now been introduced on VetBact, which means that many of the species have been given new genus names or moved to another higher taxon. 

Published 2021-11-25. Read more...

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