| Bacillus wiedmannii |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Bacillota (Firmicutes), Class Bacilli, Order Caryophanales, Family Bacillaceae, Genus Bacillus, Bacillus wiedmannii Miller et
al. 2016.
al. 2016.
Gram-positive rods, 1.2 x 2.8 µm, occuring singly or in pairs. Most strains are motile.
Produce central, ellipsoidal endospores, not deforming the cells.
Produce central, ellipsoidal endospores, not deforming the cells.
Colonies on BHI agar at 37 ºC for 24 h are cream coloured, round and flat, with a
rough surface. Grows at 5-43 ºC (optimum at 20-40 ºC), at pH 5-10 and in 0-5% NaCl.
Haemolytic on sheep’s blood trypticase soy agar. Facultatively anaerobic.
rough surface. Grows at 5-43 ºC (optimum at 20-40 ºC), at pH 5-10 and in 0-5% NaCl.
Haemolytic on sheep’s blood trypticase soy agar. Facultatively anaerobic.
Isolated from dairy foods and dairy environments. The type strain was isolated from a silo raw milk sample collected from a dairy
powder processing plant in the north-eastern USA.
powder processing plant in the north-eastern USA.
Produces toxins HBL and the non-haemolytic toxin NHE. Cells are cytotoxic in a HeLa cell culture model.
- Miller RA, Beno SM, Kent DJ, Carroll LM, Martin NH, Boor KJ, Kovac J. Bacillus wiedmannii sp. nov., a psychrotolerant and cytotoxic
Bacillus cereus group species isolated from dairy foods and dairy environments. Int J Syst Evol Microbiol 2016; 66:4744-4753. - Liu Y, Du J, Lai Q, Zeng R, Ye D, Xu J, Shao Z. Proposal of nine novel species of the Bacillus cereus group. Int J Syst Evol Microbiol
2017; 67:2499-2508.
Positive results for catalase, caseinase, esculin hydrolysis, egg yolk lecithinase, gelatinase, starch hydrolysis, Voges-Proskauer
reaction, acid production from: N-acetylglucosamine, arbutin, cellobiose, D-fructose, D-glucose, glycogen, maltose, ribose, salicin,
starch and trehalose.
Negative results for arginine dihydrolase, beta-galactosidase, H2S production, indole production, lysine decarboxylase, ornithine
decarboxylase, oxidase, tryptophan deaminase, urease, acid production from: D- and L-arabinose, D- and L-arabitol, D-adonitol,
dulcitol, erythritol, D- and L-fucose, galactose, gentiobiose, glycerol, inositol, inulin, 2- and 5-ketogluconate, lactose, D-lyxose,
D-mannitol, D-mannose, melibiose, melezitose, methyl alpha-D-glucoside, methyl alpha-D-mannopyranoside, raffinose, L-rhamnose,
L-sorbose, sucrose, D-sorbitol, D-tagatose, methyl beta-D-xylopyranoside, xylitol, D- and L-xylose.
Variable for citrate utilization, nitrate reduction, acid production from: amygdalin, potassium gluconate and mannose.
reaction, acid production from: N-acetylglucosamine, arbutin, cellobiose, D-fructose, D-glucose, glycogen, maltose, ribose, salicin,
starch and trehalose.
Negative results for arginine dihydrolase, beta-galactosidase, H2S production, indole production, lysine decarboxylase, ornithine
decarboxylase, oxidase, tryptophan deaminase, urease, acid production from: D- and L-arabinose, D- and L-arabitol, D-adonitol,
dulcitol, erythritol, D- and L-fucose, galactose, gentiobiose, glycerol, inositol, inulin, 2- and 5-ketogluconate, lactose, D-lyxose,
D-mannitol, D-mannose, melibiose, melezitose, methyl alpha-D-glucoside, methyl alpha-D-mannopyranoside, raffinose, L-rhamnose,
L-sorbose, sucrose, D-sorbitol, D-tagatose, methyl beta-D-xylopyranoside, xylitol, D- and L-xylose.
Variable for citrate utilization, nitrate reduction, acid production from: amygdalin, potassium gluconate and mannose.
(c) Costin Stoica
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