| Actinomyces neuii |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Actinomyces,
- Actinomyces neuii subsp. anitratus, Funke, Stubbs, von Graevenitz and Collins 1994.
- Actinomyces neuii subsp. neuii, Funke, Stubbs, von Graevenitz and Collins 1994.
Historical synonyms: CDC coryneform group 1, atypical CDC A-4 strains ( for A. neuii subsp. neuii) and CDC coryneform group 1-like
(for A. neuii subsp. anitratus).
Actinomycetaceae, Genus Actinomyces,
- Actinomyces neuii subsp. anitratus, Funke, Stubbs, von Graevenitz and Collins 1994.
- Actinomyces neuii subsp. neuii, Funke, Stubbs, von Graevenitz and Collins 1994.
Historical synonyms: CDC coryneform group 1, atypical CDC A-4 strains ( for A. neuii subsp. neuii) and CDC coryneform group 1-like
(for A. neuii subsp. anitratus).
Gram-positive diphtheroidal rods, arranged in clusters or V/Y forms, and coccobacilli.
Non-spore-forming. Non-motile.
Non-spore-forming. Non-motile.
Colonies are smooth, convex, opaque, whitish, 0.5-1.5 mm in diameter after 48 h of
incubation, 5% CO2, on sheep blood agar. Subsp. neuii is alpha-haemolytic on
sheep blood agar (most strains) and on human blood agar. Subsp. anitratus is not
haemolytic. Facultative anaerobic. Grows at 37 ºC. CAMP test is positive.
incubation, 5% CO2, on sheep blood agar. Subsp. neuii is alpha-haemolytic on
sheep blood agar (most strains) and on human blood agar. Subsp. anitratus is not
haemolytic. Facultative anaerobic. Grows at 37 ºC. CAMP test is positive.
Isolated mainly from human clinical samples (absceses, skin lesions, genitourinary infections, endophthalmitis).
Susceptible to beta-lactams, clindamycin, vancomycin, erythromycin, rifampin, and tetracycline.
Susceptible to beta-lactams, clindamycin, vancomycin, erythromycin, rifampin, and tetracycline.
Cause human endophthalmitis. One case of a fatal septicaemia reported. Isolated mainly from abscesses (genitourinary infections,
skin lesions) in association with mixed anaerobic flora and from human blood culture.
skin lesions) in association with mixed anaerobic flora and from human blood culture.
- Funke G., Stubbs S., von Graevenitz, and Collins M. D., 1994. Assignment of Human-Derived CDC Group 1 Coryneform Bacteria
and CDC Group 1-Like Coryneform Bacteria to the Genus Actinomyces as Actinomyces neuii subsp. neuii sp. nov., subsp. nov.,
and Actinomyces neuii subsp. anitratus subsp. nov. Int. J. Syst. Bacteriol. Vol. 44, No. 1, 167-171. - Funke G., von Graevenitz A., Clarridge III J.E., and Bernard K.A., 1997. Clinical Microbiology of Coryneform Bacteria. Clinical
Microbiology Rewiews Vol. 10, No. 1, p. 125-159.
Description is based on API 50CH, 5 days, and API CORYNE (code 2410735, 2510735, and 3410735).
Positive results for catalase, alpha- and beta-galactosidase, alpha-glucosidase, alpha-mannosidase, leucine arylamidase,
pyrazinamidase, acid production from: D-arabitol, erythritol, D-fructose, D-galactose, D-glucose, glycerol, 5-ketogluconate, inositol,
lactose, D-lyxose, maltose, D-mannitol, D-mannose, melezitose, melibiose, raffinose, D-ribose, sucrose, trehalose and D-xylose.
Negative results for acid phosphatase, esculin hydrolysis, gelatin hydrolysis, beta-glucosidase, beta-glucuronidase, urease, trypsin,
chymotrypsin, valine arylamidase, acid production from: D-arabinose, 2-ketogluconate, L-rhamnose, L-sorbose and L-xylose.
Variable results for acid production from: L-arabitol, cellobiose, dulcitol, L- and D-fucose, gluconate, gentiobiose, glycogen,
N-acetylglucosamine and D-tagatose.
Positive results for catalase, alpha- and beta-galactosidase, alpha-glucosidase, alpha-mannosidase, leucine arylamidase,
pyrazinamidase, acid production from: D-arabitol, erythritol, D-fructose, D-galactose, D-glucose, glycerol, 5-ketogluconate, inositol,
lactose, D-lyxose, maltose, D-mannitol, D-mannose, melezitose, melibiose, raffinose, D-ribose, sucrose, trehalose and D-xylose.
Negative results for acid phosphatase, esculin hydrolysis, gelatin hydrolysis, beta-glucosidase, beta-glucuronidase, urease, trypsin,
chymotrypsin, valine arylamidase, acid production from: D-arabinose, 2-ketogluconate, L-rhamnose, L-sorbose and L-xylose.
Variable results for acid production from: L-arabitol, cellobiose, dulcitol, L- and D-fucose, gluconate, gentiobiose, glycogen,
N-acetylglucosamine and D-tagatose.
(c) Costin Stoica
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Legend: + positive, - negative, v variable.
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Differential characters of the subspecies:
