| Listeria weihenstephanensis |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Bacillales, Family Listeriaceae, Genus Listeria, Listeria weihenstephanensis Lang Halter et
al. 2013.
al. 2013.
Gram-positive, regular rods, 0.4-0.5 x 2.0-4.5 µm. Capsule is not formed. Spores
are not produced. Slightly motile when cultured at 15-30 ºC (motility was not
observed in later tests).
are not produced. Slightly motile when cultured at 15-30 ºC (motility was not
observed in later tests).
Colonies on TSA are 1.0-2.5 mm in diameter, translucent, round, smooth, whitish and
low convex with slightly irregular margins. Present a blue iridescence on TSA when
viewed by oblique transmitted light. Facultative anaerobic. Optimum growth
temperature is 28-34 ºC. Hemolysis is not produced. Camp-negative. Grow in PC
broth at 3 ºC within 10 days. No growth is observed at 38 ºC. Optimal growth occurs at
pH 7-8. Can grow in nutrient broth containing up to 6.5 % (w/v) NaCl.
low convex with slightly irregular margins. Present a blue iridescence on TSA when
viewed by oblique transmitted light. Facultative anaerobic. Optimum growth
temperature is 28-34 ºC. Hemolysis is not produced. Camp-negative. Grow in PC
broth at 3 ºC within 10 days. No growth is observed at 38 ºC. Optimal growth occurs at
pH 7-8. Can grow in nutrient broth containing up to 6.5 % (w/v) NaCl.
Isolated from the water plant Lemna trisulca sampled from a freshwater pond in Bavaria, Germany
Undetermined.
- Lang Halter E, Neuhaus K, Scherer S. 2013. Listeria weihenstephanensis sp. nov., isolated from the water plant Lemna trisulca
taken from a freshwater pond. Int J Syst Evol Microbiol 63(2):641-647. - Weller D, Andrus A, Wiedmann M, den Bakker H. 2015. Listeria booriae sp. nov. and Listeria newyorkensis sp. nov., from food
processing environments in the USA. Int J Syst Evol Microbiol 65(1):286-292.
Some characters were determined using API Listeria (numerical profile 2710) and API 50 CH kits.
Positive results for catalase, esculin hydrolysis, methyl red test, nitrate reduction, acid production from: N-acetylglucosamine,
amygdalin, arbutin, D-arabitol, cellobiose, esculin, D-fructose, methyl alpha-D-glucopyranoside, glycerol, glycogen, gentiobiose,
D-glucose, D-mannose, D-mannitol, maltose, L-rhamnose, salicin, starch, trehalose, xylitol & D-xylose.
Negative results for arylamidase, alpha-mannosidase, H2S production, indole production, oxidase, urea hydrolysis, Voges-Proskauer
test, acid production from: D- and L-arabinose, D-adonitol, L-arabitol, dulcitol, erythritol, D- and L-fucose, glucose 1-phospate,
D-galactose, gluconate, 2-ketogluconate, inulin, D-lyxose, methyl alpha-D-mannopyranoside, melibiose, melezitose, raffinose,
D-sorbitol, L-sorbose, sucrose, turanose, D-tagatose, methyl beta-D-xylopyranoside & L-xylose.
Contradictory results in different studies for acidification of: inositol, 5-ketogluconate, lactose & D-ribose.
Positive results for catalase, esculin hydrolysis, methyl red test, nitrate reduction, acid production from: N-acetylglucosamine,
amygdalin, arbutin, D-arabitol, cellobiose, esculin, D-fructose, methyl alpha-D-glucopyranoside, glycerol, glycogen, gentiobiose,
D-glucose, D-mannose, D-mannitol, maltose, L-rhamnose, salicin, starch, trehalose, xylitol & D-xylose.
Negative results for arylamidase, alpha-mannosidase, H2S production, indole production, oxidase, urea hydrolysis, Voges-Proskauer
test, acid production from: D- and L-arabinose, D-adonitol, L-arabitol, dulcitol, erythritol, D- and L-fucose, glucose 1-phospate,
D-galactose, gluconate, 2-ketogluconate, inulin, D-lyxose, methyl alpha-D-mannopyranoside, melibiose, melezitose, raffinose,
D-sorbitol, L-sorbose, sucrose, turanose, D-tagatose, methyl beta-D-xylopyranoside & L-xylose.
Contradictory results in different studies for acidification of: inositol, 5-ketogluconate, lactose & D-ribose.
(c) Costin Stoica
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