First Case of Liver Abscess in Scandinavia Due to the International Hypervirulent Klebsiella Pneumoniae Clone ST23

Svend Gundestrup 1, Carsten Struve 2, 3, Steen G. Stahlhut 2, Dennis SchrØder Hansen 4, *
1 Department of Medicine, Frederiksund Hospital, Denmark
2 Department of Microbiology and Infection Control, Statens Serum Institut, Denmark
3 WHO Collaborating Centre for Reference and Research on Escherichia and Klebsiella, Statens Serum Institut, Denmark
4 Department of Clinical Microbiology, Herlev Hospital, Denmark

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© Gundestrup et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Department of Clinical Microbiology, Herlev Hospital, Herlev Ringvej 75, DK-2730 Herlev, Denmark; Tel: +45 3868 5283; Fax: +45 3868 3772; E-mail:


This is the first case report from Scandinavia of a pyogenic liver abscess caused by a Klebsiella pneumoniae isolate belonging to the international hyper virulent clone ST23. The patient, an 85-year old Caucasian, had no history of foreign travel or any classical predisposing factors for infection. The isolate was hypermucoviscous of capsular serotype K1 and carried the virulence factors aerobactin, allS, kfu and rmpA.

Keywords: Klebsiella pneumoniae, liver abscess, ST23.