Undetermined. Isolated from breast abscess, brain abscess, cheek abscess, submandibular abscess, postauricular abscess and
Phylum Actinobacteria, Class Actinobacteria, Subclass Actibacteridae, Order Actynomycetales, Suborder Actinomycinae, Family
Actinomycetaceae, Genus Varibaculum, Varibaculum cambriense Hall, Collins, Lawson, Hutson, Falsen, Inganas and Duerden 2003.
Gram-positive short, straight or curved diphtheroid rods. Non-motile. Non-acid-fast.
Colonies are convex, glistening, translucent white or gray, pinpoint after 2-3 days of
anaerobic incubation at 37 ºC on Columbia agar or fastidious anaerobe agar with 5%
horse blood. Anaerobic.
Isolated from human sources (abscesses). The habitat is not known.
- Hall V., Collins M.D., Lawson P.A., Hutson R.A., Falsen E., Inganas E. and Duerden B., 2003. Characterization of Some
Actinomyces-Like Isolates from Human Clinical Sources: Description of Varibaculum cambriensis gen. nov., sp. nov. J Clin
- Glaeser S.P., Doijad S., Hijazin M., Chakraborty T., Falsen E., Hall V., and Kämpfer P., 2016. Varibaculum anthropi sp. nov.
represented by three genetically different genomovars isolated from clinical material and emended description of the genus
Varibaculum. Syst Appl Microbiol 39(8) 546-552.
Description is based on API Coryne and Rapid ID 32 Strep (bioMerieux) results.
Positive results for leucine arylamidase, alpha-glucosidase, hippurate hydrolysis, proline arylamidase, acid production from
D-glucose and sucrose.
Negative results for alkaline phosphatase, arginine dihydrolase, catalase, esculin hydrolysis, alpha-fucosidase, alpha-galactosidase,
beta-glucosidase, beta-glucuronidase, gelatin hydrolysis, N-acetyl-beta-glucosaminidase, indole production, lecithinase, lipase,
alpha-mannosidase, pyrrolidonyl arylamidase, pyrazinamidase, serine arylamidase, starch hydrolysis, trypsin, alpha-chymotrypsin,
urease, valine arylamidase, Voges-Proskauer test, acid production from amygdalin, arabinose, arabitol, cellobiose, glycogen, lactose,
mannose, melibiose, melezitose, methyl-beta-D-glucopyranoside, raffinose, salicin, sorbitol and tagatose.
Variable results for acid phosphatase (weak), esterase C4 (weak), ester lipase C8 (weak), beta-galactosidase, nitrate reduction,
phosphoamidase (weak), acid production from fructose, maltose, mannitol, ribose, trehalose and D-xylose.
(c) Costin Stoica