| Escherichia hermannii |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Enterobacterales, Family Enterobacteriaceae, Genus Escherichia,
Escherichia hermannii Brenner et al. 1983.
Escherichia hermannii Brenner et al. 1983.
Gram-negative, 0.5-1.5 x 2.0-6.0 μm, straight, bacilli or coccobacilli. Non-spore-
forming. Motile by peritrichous flagella.
forming. Motile by peritrichous flagella.
Colonies are yellow - pigmented. Aerobic, facultatively anaerobic. Optimum growth
temperature 37 ºC. Grows readily on simple nutrient media like Nutrient agar or
nutrient broth.
temperature 37 ºC. Grows readily on simple nutrient media like Nutrient agar or
nutrient broth.
Isolated from wounds, sputa and feces, there have also been a few isolations from lungs, spinal fluid and blood. Also isolated from
the sludge of an industrial wastewater treatment plant. It grows in and degrades high concentrations of chlorobenzene.
the sludge of an industrial wastewater treatment plant. It grows in and degrades high concentrations of chlorobenzene.
Isolated from clinical samples.
- 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. - 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. - Brenner (D.J.) et al.: Atypical biogroups of Escherichia coli found in clinical specimens and description of Escherichia hermannii sp.
nov. J. Clin. Microbiol., 1982, 15, 703-713. - Adeolu M, Alnajar S, Naushad S, S Gupta R. Genome-based phylogeny and taxonomy of the 'Enterobacteriales': proposal for
Enterobacterales ord. nov. divided into the families Enterobacteriaceae, Erwiniaceae fam. nov., Pectobacteriaceae fam. nov.,
Yersiniaceae fam. nov., Hafniaceae fam. nov., Morganellaceae fam. nov., and Budviciaceae fam. nov. Int J Syst Evol Microbiol 2016.
Glucose and other carbohydrates are fermented with the production of pyruvate,
which is converted into lactic, acetic and formic acids. Part of the formic acid is
split into CO2 and H2.
Positive results for catalase, nitrate reduction, acid production from: L-arabinose, D-mannitol, D-mannose and trehalose.
Negative results for oxidase, H2S production, urease, Voges-Proskauer reaction, DN-ase, lipase, gelatinase, citrate utilization,
phenylalanine and acid production from inositol.
which is converted into lactic, acetic and formic acids. Part of the formic acid is
split into CO2 and H2.
Positive results for catalase, nitrate reduction, acid production from: L-arabinose, D-mannitol, D-mannose and trehalose.
Negative results for oxidase, H2S production, urease, Voges-Proskauer reaction, DN-ase, lipase, gelatinase, citrate utilization,
phenylalanine and acid production from inositol.
(c) Costin Stoica
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Differential characters of the species:
Legend: + positive 90-100%, - negative 90-100%, [+] positive 75-89%, [-] negative 75-89%, d positive 25-74% of strains, nd not determined.
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