| Amedibacterium intestinale |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Bacillota (Firmicutes), Class Erysipelotrichia, Order Erysipelothrichales, Family Erysipelotrichaceae, Genus Amedibacterium,
Amedibacterium intestinale Ikeyama et al. 2020, type species of the genus.
Synonym: Absiella argi Paek et al. 2020.
Amedibacterium intestinale Ikeyama et al. 2020, type species of the genus.
Synonym: Absiella argi Paek et al. 2020.
Gram-positive, straight rods or coccobacilli, 0.4 x 1.7 µm. The ends of the cells are
usually slightly tapered. Non-motile. Non-spore-forming.
usually slightly tapered. Non-motile. Non-spore-forming.
Colonies on EG agar after 3 days of incubation at 37 ºC under anaerobic conditions
are 0.5 to 2 mm in diameter, grey, circular, convex and opaque. After long-term
incubation forms umbilicated colonies on EG agar plates (dog isolates do not form
umbilicated colonies). The colonies formed on BHI with 5% sheep blood are
entire, convex, and opaque to translucent, granular, dull, and smooth. Grows at 20–40
ºC (optimum, 37 ºC), at pH 6.2 to 8.0 (optimum, pH 7.0) and in 0.3-2.3% (w/v) NaCl
broth (optimum, 1.0 %). Growth occurs on medium containing 20% (w/v) bile.
Obligately anaerobic.
are 0.5 to 2 mm in diameter, grey, circular, convex and opaque. After long-term
incubation forms umbilicated colonies on EG agar plates (dog isolates do not form
umbilicated colonies). The colonies formed on BHI with 5% sheep blood are
entire, convex, and opaque to translucent, granular, dull, and smooth. Grows at 20–40
ºC (optimum, 37 ºC), at pH 6.2 to 8.0 (optimum, pH 7.0) and in 0.3-2.3% (w/v) NaCl
broth (optimum, 1.0 %). Growth occurs on medium containing 20% (w/v) bile.
Obligately anaerobic.
Isolated from human faeces and from a faecal sample of a dog.
Susceptible to amoxicillin, bacitracin, chloramphenicol, oxytetracycline (variable), penicillin and vancomycin. Resistant to ciprofloxacin
(variable), colistin, erythromycin (variable), gentamicin, kanamycin, neomycin, streptomycin (intermediate) and sulfamethoxazole +
trimethoprim.
Susceptible to amoxicillin, bacitracin, chloramphenicol, oxytetracycline (variable), penicillin and vancomycin. Resistant to ciprofloxacin
(variable), colistin, erythromycin (variable), gentamicin, kanamycin, neomycin, streptomycin (intermediate) and sulfamethoxazole +
trimethoprim.
Undetermined.
- Ikeyama N, Toyoda A, Morohoshi S, Kunihiro T, Murakami T, Mori H, Iino T, Ohkuma M, Sakamoto M. Amedibacterium intestinale
gen. nov., sp. nov., isolated from human faeces, and reclassification of Eubacterium dolichum Moore et al. 1976 (Approved Lists
1980) as Amedibacillus dolichus gen. nov., comb. nov. Int J Syst Evol Microbiol 2020; 70:3656-3664. - Paek J, Shin Y, Kim JS, Kim H, Kook JK, Paek WK, Chang YH. Description of Absiella argi gen. nov., sp. nov., and transfer of
Eubacterium dolichum and Eubacterium tortuosum to the genus Absiella as Absiella dolichum comb. nov. and Absiella
tortuosum comb. nov. Anaerobe 2017; 48:70-75.
Positive results for acid and alkaline phosphatase, esterase, esterase lipase, H2S production, N-acetyl-beta- glucosaminidase,
naphthol-AS-BI-phosphohydrolase, 6-phospho-beta-galactosidase, acid production from: amygdalin, cellobiose, dextrin, D-fructose,
L-fucose, galactose, gentibiose, D-glucose, maltose, D-mannitol, palatinose, salicin and turanose.
Negative results for alanine arylamidase, alpha-arabinosidase, arginine dihydrolase, catalase, chymotrypsin, cystine arylamidase,
casein hydrolysis, alpha-fucosidase, glutamic acid decarboxylase, alpha- and beta-galactosidase, beta-glucuronidase, gelatinase,
glycine arylamidase, histidine arylamidase, indole production, leucine arylamidase, leucyl glycine arylamidase, lipase,
alpha-mannosidase, nitrate reduction, phenylalanine arylamidase, proline arylamidase, pyroglutamic acid arylamidase, serine
arylamidase, starch hydrolysis, tyrosine arylamidase, trypsin, urease, valine arylamidase, Voges-Proskauer test, acid production
from: L-arabinose, glycerol, lactose, melezitose, L-rhamnose, D-sorbitol and sucrose.
Variable results for arginine arylamidase, aesculin hydrolysis, alpha- and beta-glucosidase, acid production from: D-mannose,
raffinose, trehalose and D-xylose.
naphthol-AS-BI-phosphohydrolase, 6-phospho-beta-galactosidase, acid production from: amygdalin, cellobiose, dextrin, D-fructose,
L-fucose, galactose, gentibiose, D-glucose, maltose, D-mannitol, palatinose, salicin and turanose.
Negative results for alanine arylamidase, alpha-arabinosidase, arginine dihydrolase, catalase, chymotrypsin, cystine arylamidase,
casein hydrolysis, alpha-fucosidase, glutamic acid decarboxylase, alpha- and beta-galactosidase, beta-glucuronidase, gelatinase,
glycine arylamidase, histidine arylamidase, indole production, leucine arylamidase, leucyl glycine arylamidase, lipase,
alpha-mannosidase, nitrate reduction, phenylalanine arylamidase, proline arylamidase, pyroglutamic acid arylamidase, serine
arylamidase, starch hydrolysis, tyrosine arylamidase, trypsin, urease, valine arylamidase, Voges-Proskauer test, acid production
from: L-arabinose, glycerol, lactose, melezitose, L-rhamnose, D-sorbitol and sucrose.
Variable results for arginine arylamidase, aesculin hydrolysis, alpha- and beta-glucosidase, acid production from: D-mannose,
raffinose, trehalose and D-xylose.
(c) Costin Stoica
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