Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Actinobacteria, Class Actinobacteria , Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium,
Corynebacterium matruchotii (Mendel 1919) Collins 1983.

Historical synonyms:
Bacterionema matruchotii (Mendel 1919) Gilmour, Howell and Bibby 1961, Cladothrix matruchoti Mendel 1919,
Oospora matruchoti (Mendel) Sartory 1920, Actinomyces matruchoti (Mendel) Nannizzi 1934.
Characteristic Gram-positive bacilli with ‘whip handles’. Metachromatic granules are
formed. Nonmotile.
Microcolonies may appear flat or spider-like. Macrocolony appearance is variable:
-aerobic incubation:  0.5-1.5 mm in diameter, convex or umbonate, rough, with entire
to filamentous or lobate margin, opaque, tough or soft and adherent or non-adherent
to medium.
-anaerobic incubation: 1-2 mm, rough colonies, flat with filamentous edges, opaque
at the center to translucent at the edges, tough and adherent to the medium.
Facultatively anaerobic. CAMP reaction is negative. Optimum growth temperature is
37 ºC. No growth in 10% bile or 6.5% NaCl media.
It's thought to be an inhabitant of the oral cavity of animals and humans but has only rarely been recovered from human infections.
Sensitive to bacitracin, erythromycin, neomycin, oxytetracycline, penicillin and tetracycline.
Is a rare human pathogen
  1. 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.
  2. Funke G ., 2006.Corynebacteria and rare coryneforms. In: Topley & Wilson’s Microbiology & Microbial Infections, 10th Edition,
    Edited by Borriello S.P., Murray P.R. and Funke G.,Edward Arnold (Publishers) Ltd., Bacteriology, volume 2.
  3. Holt J.G., Krieg N.R., Sneath P.H.A., Staley J.T. and Williams S.T., 1994. Bergey's Manual of Determinative Bacteriology, Ninth
    Edition, Williams & Wilkins, A Waverly Company, Baltimore, pp 571-596.
  4. Gilmour M.N., 1975. Genus IV. Bacterionema Gilmour, Howell and Bibby 1961. In: Buchanan R.E. and Gibbons N.E. (Editors),
    Bergey’s Manual of Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company, Baltimore, 676-679.
Fermentative metabolism.

Positive results for catalase, esculin hydrolysis, hippurate hydrolysis, nitrate reduction, pyrazinamidase, starch hydrolysis,
Voges-Proskauer reaction, acid production from: dextrin, fructose, glucose, maltose, mannose, salicin & sucrose.

Negative results for alkaline phosphatase, gelatinase, H
2S production, indole production, lipophilism, methyl red,  acid production
from: arabinose, cellobiose, dulcitol, galactose, glycerol, inositol, inulin, lactose, mannitol, melezitose, melibiose, rhamnose, sorbitol,
starch, trehalose & xylose.

Variable results for urease & acid production from raffinose.
Corynebacterium matruchotii
(c) Costin Stoica
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