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


Weeks in Review


Weeks to Publication
Indexed in KCI, KoreaMed, Synapse, DOAJ
Open Access, Peer Reviewed
pISSN 2288-0585 eISSN 2288-6850

Aberrant Forms of Escherichia coli in Urine Culture

Case report

Annals of Clinical Microbiology (Ann Clin Microbiol) 2010 September, Volume 13, Issue 3, pages 128-131.

Aberrant Forms of Escherichia coli in Urine Culture

Youngeun Ma, Jang Ho Lee, Seung-Tae Lee, Chang-Seok Ki, Nam Yong Lee

Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea


Bacterial morphology can be altered by various factors, including antibiotics. Unusually shaped, large, swollen organisms were observed in a urine culture obtained from a patient who had no history of antibiotic therapy. The organism was identified as Escherichia coli by the Vitek 2 system and by DNA sequencing of 16S rRNA and gyrB. The patient had no symptoms except fever, which subsided without medication. Microbiology laboratories should be aware of the potential appearance of such bacilli to avoid confusion with fungi and other naturally occurring filamentous organisms. (Korean J Clin Microbiol 2010;13:128-131)


Atypical bacterial forms, Escherichia coli, Urine