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Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium,
Corynebacterium imitans Funke, Efstratiou, Kuklinska, Hutson, De Zoysa, Engler and
Collins  1997.
Gram-positive diphtheroid cells. Nonmotile. Nonspore-forming.
Colonies are white-grayish, glistening, convex, creamy and 1-2 mm in diameter with
entire edges after 24 h of incubation at 37 ºC in a 5% CO
2-enriched atmosphere on
sheep blood Columbia agar. CAMP test is positive.
Isolated from human (nasopharyngeal specimen, throat swabs) diagnosed with pharyngeal diphtheria.
Does not possess the diphtheria toxin gene. It's disease association is questionable.
  1. Funke G., Efstratiou A., Kuklinska D., Hutson R.A., De Zoysa A., Engler K.H. and Collins M.D., 1997. Corynebacterium imitans sp.
    nov., isolated from patients with suspected diphtheria. J. Clin. Microb. Vol. 35, No.8, 1978-1983.
  2. Funke G. and Frodl R., 2008. Comprehensive Study of Corynebacterium freneyi Strains and Extended and Emended Description
    of Corynebacterium freneyi Renaud, Aubel, Riegel, Meugnier, and Bollet 2001. J. Clin. Microb. Vol. 46, No. 2 , p 638-643.
Fermentative metabolism.
Description of most biochemical tests is based on API CORYNE, API 50CH & API ZYM.

Positive results for acid phosphatase, alkaline phosphatase, catalase, esterase (C4),
esterase lipase (C8), pyrazinamidase (weak), acid production from: D-arabinose,
fructose, L-fucose, glucose, lactose, maltose, mannose, ribose & sucrose (weak).

Negative results for chymotrypsin activity, esculin hydrolysis, lipophilism, nitrate reduction, tyrosine hydrolysis, urease, acid production
from: N-acetylglucosamine, adonitol, amygdalin, L-arabinose, arabitol, arbutin, cellobiose, dulcitol, erythritol, D-fucose, galactose,  
beta-gentiobiose, gluconate, 2-ketogluconate, glycerol, glycogen, inositol, inulin, lyxose, mannitol, melezitose, melibiose, raffinose,
rhamnose, salicin, sorbitol, sorbose, tagatose, trehalose, turanose, xylitol & xylose.
Corynebacterium imitans
(c) Costin Stoica
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