Taxonomy
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Phylum Actinobacteria, Class Actinobacteria, Order Micrococcales, Family Brevibacteriaceae, Genus Brevibacterium, Brevibacterium
mcbrellneri
McBride, Ellner, Black, Clarridge and Wolf 1994.
Gram-positive rods; became predominantly coccal on CYA (Czapek’s Mineral Agar
with Yeast extract) medium only after incubation for 2 weeks at 37 ºC. Nonmotile.
Spores are not produced. Mycolic acids are not present.
Colonies are opaque, dry, grey-cream, raised with a bevelled margin and had a
contoured glistening surface, with edges crenated, consistency friable and 1-2 to 3-5
mm in diameter after 2 to 5 days of incubation at 35-37 ºC on Casman’s sheep blood
agar (Difco). Growth poorly on media without blood, with two colony types, a pinpoint
colony and a larger smooth colony. Beta-haemolytic. Unpleasant odor produced.  
Strict aerobic. Nonfastidious. Halotolerant (6.5% NaCl). Can grow optimally at 35-37
ºC. Weak growth at 25 ºC and no growth at 10 ºC.
Isolated from infected genital hair of patients with piedra in association with Trichosporon beigelii.
Sensitive to penicillin, ampicillin, cephalothin, trimethoprim sulphate and vancomycin. Resistant to erythromycin, oxacillin and
tetracycline.
The strong proteolytic properties may be the mechanism of pathogenesis (in the attachment and invasion of keratin structures such
as hair).
  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. Trujillo M.E. and Goodfellow M., 2012. Genus I. Brevibacterium Breed 1953, emend. Collins, Jones, Keddie and Sneath 1980.In:
    Goodfellow M., Kampfer P., Busse H.J., Trujillo M.E., Suzuki K., Ludwig W. and Whitman W.B. (Editors), Bergey’s Manual of
    Systematic Bacteriology, second edition, Vol. Five, The Actinobacteria, Part A, Springer, Athens, pp. 685-700.
  4. McBride, M.E., Ellner, K.M., Black, H.S., Clarridge, J.E. and Wolf, J.E., 1993. A new Brevibacterium sp. isolated from infected genital
    hair of patients with white piedra. J. Med. Microbiol. Vol. 39, 255-261.
Oxidative metabolism. Not acid fast. Strong proteolytic. Produces methanethiol.

Positive results for casein hydrolysis, catalase, DNA hydrolysis, gelatin hydrolysis, tellurite reduction, acid production from:
2,3-butylene glycol & phenylacetate.

Negative results for arginine decarboxylase, alpha-glucosidase, H2S production, indole production, lysine decarboxylase, nitrate
reduction, ornithine decarboxylase, oxidase, pyrazinaminidase, pyrrolidone peptidase, Tween 80 hydrolysis, urease, acid production
from: glucose, maltose, mannitol, sucrose & xylose.

Variable results for tyrosine hydrolysis & xanthine hydrolysis.

Can utilize ribose, but not D-arabinose, gluconate, mannitol or mannose.
Brevibacterium mcbrellneri
(c) Costin Stoica
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