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J Med Microbiol 57 (2008), 121-124; DOI: 10.1099/jmm.0.47380-0
© 2008 Society for General Microbiology
ISSN 1473-5644

Case Report

Upper and lower urinary tract infection caused by Klebsiella pneumoniae serotype K2 and CTX-M-15 β-lactamase-producing serotype K1: a case report and characterization of serum killing resistance

Noriyuki Nagano1, Christophe Cordevant2,{dagger} and Yukiko Nagano1

1 Medical Microbiology Laboratory, Funabashi Municipal Medical Center, 1-21-1 Kanasugi, Fubanashi, Chiba 273-8588, Japan

2 Molecular Typing Center, Institut Pasteur de Lille, 1 Rue du Prof. Calmette, F-59019 Lille Cedex, France

Correspondence
Noriyuki Nagano
naganoyn{at}d3.dion.ne.jp

Received 5 May 2007
Accepted 7 September 2007

CTX-M-15 β-lactamase-producing Klebsiella pneumoniae serotype K1 was isolated from a patient with fatal upper urinary tract infection (UTI) complicated by sepsis caused by K. pneumoniae serotype K2. Transfer of a CTX-M-15 β-lactamase plasmid from the K1 to the K2 strain was observed. However, plasmid acquisition by the K2 strain did not occur in vivo, suggesting that the K1 strain might not have contributed directly to the upper UTI. In addition, effects of K serotypes and plasmid acquisition on K. pneumoniae serum resistance were examined.

Abbreviations: ESBL, extended-spectrum β-lactamase; UTI, urinary tract infection.

{dagger}Present address: Food Science Division, Bio-Rad, Route de Cassel, 59114 Steenvoorde, France.






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