Taxonomy
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Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium,
Corynebacterium confusum Funke, Osorio, Frei, Riegel and Collins 1998.
Gram-positive, typical club-shaped rods that occur as single cells, in pairs or in small
clusters. Nonmotile. Nonspore-forming. Contains small amounts of TBSA (1-3%).
Colonies are whitish, glistening, convex, creamy and up to 1.5 mm in diameter after
48 h of incubation at 37 ºC on sheep blood agar in a 5% CO
2-enriched atmosphere.
CAMP test is negative. Weak anaerobic growth.
Isolated from patients with foot infections, a blood culture, and a breast abscess.
Susceptible to penicillin G, ticarcillin, cephalotin, ceftriaxone, amikacin, tobramycin, tetracyclines, quinolones, vancomycin. Resistant to
aztreonam and fosfomycin.
Isolated from patients with foot infections, a blood culture, and a breast abscess.
  1. Funke G., Osorio C.R., Frei R., Riegel P. and Collins M.D., 1998. Corynebacterium confusum sp. nov., isolated from human
    clinical specimens. IJSB 48, 1291-1296.
  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.
Fermentative metabolism.
Description of most biochemical tests is based on API CORYNE and API 50CH kits.

Positive results for alkaline phosphatase, catalase, esterase (C4), esterase lipase
(C8), nitrate reduction, pyrazinamidase, acid production from: fructose, glucose (weak),
5-ketogluconate, ribose & tagatose.

Negative results for esculin hydrolysis, lipophilism, tyrosine hydrolysis, urease, acid production from: N-acetylglucosamine, adonitol,  
amygdalin, arabinose, arabitol, arbutin, cellobiose, dulcitol, erythritol, fucose, galactose, gluconate, 2-ketogluconate, glycerol,  
glycogen, inositol, inulin, lactose, lyxose, maltose, mannitol, melezitose, melibiose, raffinose, rhamnose, salicin, sorbitol, sorbose,
sucrose, trehalose, turanose, xylitol & xylose.

Variable results for acid production from: beta-gentiobiose.
Corynebacterium confusum
(c) Costin Stoica
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