Genus Shimwellia
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacteriales, Family Enterobacteriaceae, Genus Shimwellia,
- Shimwellia blattae  Priest and Barker 2010, basonym: Escherichia blattae Burgess et al. 1973;
-
Shimwellia pseudoproteus Priest and Barker 2010 - type species of the genus, synonym: Obesumbacterium proteus biogroup 2.
Gram-negative, straight, nonmotile, nonspore-forming bacilli. S. blattae becomes
motile after incubation of more than 2 days.
Colonies are smooth, small, circular, entire, entire margins, 1.0–1.5 to 5 mm
diameter. Aerobic, facultatively anaerobic. Mesophilic with optimum growth
temperature 30-37 ºC.
Media: Nutrient agar or nutrient broth, Trypticase Soy Agar ± 5% sheep blood.
Shimwellia (Escherichia) blattae was isolated from the cockroach intestine and do not seem to have been isolated from other sources.
Shimwellia pseudoproteus was solated from brewery fermentors.
Shimwellia blattae has not been associated with disease either in humans or in cockroaches.
Shimwellia pseudoproteus is a contaminant of brewing yeasts.
  1. J. G. Holt et al., 1994. Facultatively Anaerobic Gram-Negative Rods. Subgroup 1. Family Enterobacteriaceae. In: Begey’s Manual
    of Determinative Bacteriology, 9th-edition, Williams & Wilkins, pp 175-189.
  2. Don J. Brenner and J.J. Farmer III, 2001. Family I. Enterobacteriaceae. In:  Bergey’s Manual of Systematic Bacteriology, Second
    edition, Vol two, part B, George M. Garrity (Editor-in-Chief), pp 587-897.
  3. Fergus G. Priest andMargaret Barker. Gram-negative bacteria associated with brewery yeasts: reclassification of
    Obesumbacterium proteus biogroup 2 as Shimwellia pseudoproteus gen. nov., sp. nov., and transfer of Escherichia blattae to
    Shimwellia blattae comb. nov. Int J Syst Evol Microbiol April 2010 60:828-833.
Positive results for catalase, lysine decarboxylase, ornithine decarboxylase, nitrate
reduction & acid production from glucose.

Negative results for oxidase, ONPG, arginine dihydrolase, indole production. H
2S production, urease, Voges-Proskauer reaction,
phenilalanine, gelatinase, growth on KCN media, esculin hydrolysis, DN-ase, lipase, acid production from: adonitol, lactose,
mannitol, inositol, D-sorbitol, sucrose, melibiose, cellobiose, dulcitol, alpha-methyl-D-glucoside, raffinose & salicin.
(c) Costin Stoica
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R E G N U M
PROKARYOTAE
 
Citrate
utilization
Malonate
utilization
Gas production
from glucose
L-Arabinose
(acid)
L-rhamnose
(acid)
Maltose
(acid)
D-Xylose
acid)
S. blattae
d
+
+
+
+
+
+
S. pseudoproteus
-
-
-
-
[-]
d
[-]
Differential characters of the species:
Legend: +  positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains
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