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


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pISSN 2288-0585 eISSN 2288-6850

Identification, Antimicrobial Susceptibility and Epidemiology of Klebsiella species Isolated from Clinical Specimen

Original article

Annals of Clinical Microbiology (Ann Clin Microbiol) 2000 December Volume 3, Issue 2, pages 99-110.

Identification, Antimicrobial Susceptibility and Epidemiology of Klebsiella species Isolated from Clinical Specimen

Young Uh*, Soon Deok Park, Jeong Seog Son*, Hyeun Gyeo Lee*, An Suk Jeoung*, Hyun Mi Cho*, and Kap Jun Yoon*, and Hyo Youl Kim

Departments of Clinical Pathology* and Internal Medicine**, Yonsei University Wonju College of Medicine, Wonju, and Research Institute of Bacterial Resistance***, Yonsei University College of Medicine, Seoul, Korea


Background: In recent years, the incidence of extended-spectrum β-lactamase (ESBL) producing Klebsiella has been steadily increased, and the newer species K. planticola and K. terrigena, formerly regarded as nonpathogen, have been reported with astonishing frequency from human infectious processes by some investigators. The aim of this study is to elucidate the isolation rate and antimicrobial susceptibility of recent clinical Klebsiella isolates.

Method: For the clinical Klebsiella isolates during the period of June 1999 to May 2000, isolation frequency of Klebsiella species by specimen, departments, age, and sex were analyzed. And antimicrobial susceptibilities were also analyzed.

Result: Isolation rate of Klebsiella in order of decreasing frequency were K. pneumoniae (74.7%), K. oxytoca (12.1%), K. ozaenae (1.7%), K. planticola(1.0%), K. terrigena(0.9%), and K. ornithinolytica (0.7%), respectively. K. rhinoscleromatis was not isolated. Compared with outpatients, increase of resistance rates of inpatients’s Klebsiella isolates were 10% in ciprofloxacin, 15% in cefoperazone/sulbactam, and the others were ranged from 24% to 31%. Isolation rate of ESBL producing K. pneumoniae by double disk (DD) synergy test was 41%, and detection rates by antimicrobial agents were as follows: cefotaxime (95%), aztreonam (58%), and ceftriaxone (37%). Antimicrobial susceptibility rate with the exception of ampicillin and imipenem decreased from the range of 81%-96% on admission day to 29-62% after one week on admission.

Conclusion: The isolation rates of K. planticola and K. terrigena were less than 1%. The proportion of ESBL producing K. pneumoniae was 41%. And the vast majority of multidrug resistant Klebsiella including ESBL producing strains are acquired by hospitalization. (Korean J Clin Microbiol 2000;3:99-110)


Extended-spectrum β-lactamase, Klebsiella, Klebsiella pneumoniae, Klebsiella planticola, Klebsiella terrigena, Epidemiology, Susceptibility