Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Corynebacterinae, Family
Corynebacteriaceae, Genus Corynebacterium, Corynebacterium atypicum Hall, Collins, Hutson, Lawson, Falsen and Duerden, 2003.
Description is based on a single isolate.
Gram-positive pleomorphic coryneform rods, ranging from short to medium-length
cells in pairs joined end-to-end or chains to filamentous curved cells with thickened
ends. Nonmotile. Nonspore-forming.
Colonies are pinpoint, convex, shiny and white after 48 h of incubation at 37 ºC on 5%
horse blood Columbia agar. Hemolysis is negative. Aerobic, facultatively anaerobic
Grow in: 7.5% NaCl, but not in 10% NaCl broth. Mycolic acids are not produced.
Isolated from an unknown human clinical source.
- Hall V., Collins M.D., Hutson R.A., Lawson P.A., Falsen E. and Duerden B.I., 2003. Corynebacterium atypicum sp. nov., from a
human clinical source, does not contain corynomycolic acids. IJSEM 53, 1065-1068.
- 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. Non-partially-acid-fast.
Most biochemical characters were tested on Apy-Coryne, 48 h, and APY ZYM.
Positive results for catalase, beta-glucuronidase, acid production from: glucose, maltose, ribose & sucrose.
Negative results for alkaline phosphatase, esculin hydrolysis, gelatin hydrolysis, lipophilism, nitrate reduction, pyrazinamidase,
starch hydrolysis, urease, Voges-Proskauer, acid production from: glycogen, lactose, mannitol & xylose.
(c) Costin Stoica