Annals of Clinical Microbiology, The official Journal of the Korean Society of Clinical Microbiology


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A Case of Misidentification of Dermabacter hominis as Listeria grayi

Case report

Annals of Clinical Microbiology (Ann Clin Microbiol) 2011 June, Volume 14, Issue 2, pages 79-82.

A Case of Misidentification of Dermabacter hominis as Listeria grayi

Young In Kim1, Kyoung Un Park2, Il Joong Park1, Seo-Jin Park1, Wee Gyo Lee1
Department of Laboratory Medicine, 1Ajou University School of Medicine, Suwon, 2 Seoul National University, Bundang Hospital, Seongnam, Korea


Listeria grayi is a catalase-positive, non-spore forming, and glucose-fermenting Gram-positive rod. L. grayi is widely distributed in environments such as soil, water and fresh food. Human infection by L. grayi is very rare, and there have been no cases reported in Korea, and only two cases worldwide. Dermabacter hominis is a relatively new species belonging to the coryneform bacteria and is a component of the normal human skin flora. D. hominis is a non-motile, glucose-fermenting, Gram-positive rod that has similar biochemical characteristics to L. grayi. The authors of the present study report a case initially misidentified as L. grayi via a traditional morphological and biochemical identification method but that was subsequently confirmed as D. hominis using sequence analysis of 16S rRNA. (Korean J Clin Microbiol 2011;14:79-82)


Listeria grayi, Dermabacter hominis, Misidentification