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Phylum Actinobacteria, Class Actinobacteria , Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium,
Corynebacterium xerosis Lehmann and Neumann 1899.

Nearly all
Corynebacterium xerosis strains described before 1996 may have been misidentified C. amylocolatum strains.

Historical synonyms:
Pacinia neisseri Trevisan 1889, Bacillus xerosis Lehmann and Neumann 1896, Bacterium xerosis (Lehmann
and Neumann 1896) Migula 1900,
Bacterium colomatti Chester 1901, Corynebacterium conjunctivae Lewandowsky 1904,
Mycobacterium xerosis (Lehmann and Neumann 1896) Krasil'nikov 1941.
Irregularly staining, often barred rods, with occasional granules and club forms.
Yellowish colonies, dry and granular with irregular edges; grow well on sheep blood
agar. The colonies may be small initially but in 2-3 days they are greater than 2 mm in
diameter. Granular deposit in broth with clear supernatant. CAMP test is negative. No
hemolysis. Aerobic growth.
Occur in the normal flora on both skin and oropharynx; is difficult to distinguish infection from contamination or colonization.
Susceptible to O/129 (vibriocidal agent).
Infections occur after surgery or antibiotic therapy (infections of protheses, postsurgical wound infection, nosocomial pneumonia,
infection of a pancreatic pseudocyst, spontaneous peritonitis). May be associated with endocarditis.
  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. Cummins C.S., Lelliott R.A. and Rogosa M., 1975. Genus Corynebacterium Lehmann and Neumann 1896 . In: Buchanan R.E.
    and Gibbons N.E. (Editors), Bergey’s Manual of Determinative Bacteriology, Eight Edition, The Williams & Wilkins Company,
    Baltimore, 602-617.
  4. Diaconescu A. si Damian M., 2009. Identificarea corinebacteriilor. In: Buiuc D., Negut M. (Editori), Tratat de Microbiologie Clinica,
    Editia a III-a, Editura Medicala, Bucuresti, 620-651.
Fermentative metabolism. Non-partially-acid-fast.

Positive results for alkaline phosphatase, alpha-glucosidase, leucine arylamidase,
mycolic acids, pyrazinamidase, acid production (slowly, in 72-96 hours) from: fructose,
galactose, glucose, maltose, mannose, salicin & sucrose.

Negative results for casein hydrolysis, esculin hydrolysis, gelatinase, hippurate hydrolysis, lipophilism, methyl red, tyrosine
hydrolysis, urease, acid production from: arabinose, dextrin, lactose, maltose, mannitol, raffinose, rhamnose, starch, trehalose &
xylose.

Nitrate reduction is variable.
Corynebacterium xerosis
(c) Costin Stoica
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