Taxonomy
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Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium,
Corynebacterium pilosum Yanagawa and Honda 1978.
Corynebacterium renale group.
Gram-positive rods, 0.5-1.3 µm, occurring singly, in pairs (angular arrangements) and
in masses; club-shaped forms with metachromatic granules; numerous pili are
present. Nonmotile.
Smooth colonies on nutrient agar and on serum agar, cream to pale yellow, opaque,
1 mm in diameter after 24 h at 37 ºC.
In broth a pellicle and a granular sediment were formed, with no turbidity.
Hemolysis is not produced. CAMP reaction is positive. Aerobic, facultative anaerobic.
No growth in/at: pH 5.4, or at 41.5 ºC. Can grow at pH 9.0.
Isolated from cows that showed signs of cystitis and pyelonephritis.
Cells can resist 30 min at 56 ºC. Susceptible to kanamycin, erythromycin, neomycin, bacitracin, and polymyxin B.
Cause genitourinary infections (cystitis and pyelonephritis) in animals, especially in cattle.
  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. 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.
  3. Yanagawa R. and Honda E., 1978. Corynebacterium pilosum and Corynebacterium cystitidis, Two New Species from Cows. IJSB
    Vol. 28, No. 2, p. 209-216.
Fermentative metabolism.

Positive results for catalase, hippurate hydrolysis, nitrate reduction, pyrazinamidase, starch hydrolysis, urease, acid production from:
dextrin, fructose, glucose, maltose, mannose, starch & trehalose.

Negative results for alkaline phosphatase, arginine decarboxylase, casein hydrolysis, esculin hydrolysis, gelatinase, H
2S production,
indole production, lipophilism, lysine decarboxylase, methyl red, ornithine decarboxylase, oxidase, phenylalanine deaminase, Tween
80 hydrolysis, tyrosine hydrolysis, Voges-Proskauer reaction, acid production from: arabinose, galactose, lactose, mannitol, raffinose,
rhamnose, salicin, sucrose & xylose.
Corynebacterium pilosum
(c) Costin Stoica
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