Giuseppe
Emeritus
Diversity of K. pneumoniae That Produce KPC (Emerg Infect Dis., abstract, edited)
[Source: Emerging Infectious Diseases Journal, <cite cite="http://www.cdc.gov/eid/content/16/9/1349.htm">Diversity of K. pneumoniae That Produce KPC | CDC EID</cite>. Abstract, edited.]
Worldwide Diversity of Klebsiella pneumoniae That Produce β-Lactamase blaKPC-2 Gene
Ga?lle Cuzon, Thierry Naas, HaVy Truong, Maria-Virginia Villegas, Karin T. Wisell, Yehuda Carmeli, Ana. C. Gales, Shiri Navon-Venezia, John P. Quinn, and Patrice Nordmann
Author affiliations: Institut National de la Sant? et de la Recherche M?dicale, Paris, France (G. Cuzon, T. Naas, H. Truong, P. Nordmann); International Center for Medical Research and Training, Cali, Colombia (M.V. Villegas); Swedish Institute for Infectious Disease Control, Stockholm, Sweden (K.T. Wisell); Sourasky Medical Center, Tel Aviv, Israel (Y. Carmeli, S. Navon-Venezia); Universidade Federal de S?o Paulo, S?o Paulo, Brazil (A.C. Gales); John H. Stroger Jr. Hospital of Cook County, Chicago, Illinois, USA (J.P. Quinn); and Chicago Infectious Disease Research Institute, Chicago (J.P. Quinn)
Abstract
Klebsiella pneumoniae isolates that produce carbapenemases (KPCs) are rapidly disseminating worldwide. To determine their genetic background, we investigated 16 blaKPC-2-harboring K. pneumoniae isolates from 5 countries. The isolates were multidrug resistant, possessed the blaKPC-2 gene, and differed by additional β-lactamase content. They harbored a naturally chromosome-encoded bla gene (blaSHV-1 [12.5%], blaSHV-11 [68.7%], or blaOKP-A/B [18.8%]) and several acquired and plasmid-encoded genes (blaTEM-1 [81.3%], blaCTX-M-2 [31.3%], blaCTX-M-12 [12.5%], blaCTX-M-15 [18.7%], and blaOXA-9 [37.5%]). The blaKPC-2 gene was always associated with 1 of the Tn4401 isoforms (a, b, or c). Tn4401 was inserted on different-sized plasmids that belonged to different incompatibility groups. Several blaKPC-containing K. pneumoniae clones were found: 9 different pulsotypes with 1 major (sequence type 258) and 7 minor distinct allelic profiles. Different clones harboring different plasmids but having identical genetic structure, Tn4401, could be at the origin of the worldwide spread of this emerging resistance gene.
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[Source: Emerging Infectious Diseases Journal, <cite cite="http://www.cdc.gov/eid/content/16/9/1349.htm">Diversity of K. pneumoniae That Produce KPC | CDC EID</cite>. Abstract, edited.]
Worldwide Diversity of Klebsiella pneumoniae That Produce β-Lactamase blaKPC-2 Gene
Ga?lle Cuzon, Thierry Naas, HaVy Truong, Maria-Virginia Villegas, Karin T. Wisell, Yehuda Carmeli, Ana. C. Gales, Shiri Navon-Venezia, John P. Quinn, and Patrice Nordmann
Author affiliations: Institut National de la Sant? et de la Recherche M?dicale, Paris, France (G. Cuzon, T. Naas, H. Truong, P. Nordmann); International Center for Medical Research and Training, Cali, Colombia (M.V. Villegas); Swedish Institute for Infectious Disease Control, Stockholm, Sweden (K.T. Wisell); Sourasky Medical Center, Tel Aviv, Israel (Y. Carmeli, S. Navon-Venezia); Universidade Federal de S?o Paulo, S?o Paulo, Brazil (A.C. Gales); John H. Stroger Jr. Hospital of Cook County, Chicago, Illinois, USA (J.P. Quinn); and Chicago Infectious Disease Research Institute, Chicago (J.P. Quinn)
Abstract
Klebsiella pneumoniae isolates that produce carbapenemases (KPCs) are rapidly disseminating worldwide. To determine their genetic background, we investigated 16 blaKPC-2-harboring K. pneumoniae isolates from 5 countries. The isolates were multidrug resistant, possessed the blaKPC-2 gene, and differed by additional β-lactamase content. They harbored a naturally chromosome-encoded bla gene (blaSHV-1 [12.5%], blaSHV-11 [68.7%], or blaOKP-A/B [18.8%]) and several acquired and plasmid-encoded genes (blaTEM-1 [81.3%], blaCTX-M-2 [31.3%], blaCTX-M-12 [12.5%], blaCTX-M-15 [18.7%], and blaOXA-9 [37.5%]). The blaKPC-2 gene was always associated with 1 of the Tn4401 isoforms (a, b, or c). Tn4401 was inserted on different-sized plasmids that belonged to different incompatibility groups. Several blaKPC-containing K. pneumoniae clones were found: 9 different pulsotypes with 1 major (sequence type 258) and 7 minor distinct allelic profiles. Different clones harboring different plasmids but having identical genetic structure, Tn4401, could be at the origin of the worldwide spread of this emerging resistance gene.
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