Epidemic Plasmid Carrying bla
CTX-M-15 in Klebsiella penumoniae in China |
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Authors: | Chao Zhuo Xiao-qiang Li Zhi-yong Zong Nan-Shan Zhong |
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Institution: | 1. State Key Laboratory of Respiratory Diseases, Guangzhou Medical College, Guangzhou, China.; 2. Department of Infectious Diseases, West China Hospital, Sichuan University, Chengdu, China.; Universitätsklinikum Hamburg-Eppendorf, Germany, |
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Abstract: | ObjectiveTo investigate the local epidemiology of Klebsiella penumoniae carrying bla
CTX-M-15 in southern China and to characterize the genetic environment of bla
CTX-M-15.MethodsPCR and DNA sequencing were used to detect and characterize the genetic contexts of bla
CTX-M-15. The clonal relatedness of isolates carrying bla
CTX-M-15 was determined by pulse-field gel electrophoresis. Conjugative plasmids carrying bla
CTX-M-15 were obtained by mating and were further subject to restriction analysis and replicon typing.ResultsA total of 47CTX-M-15 ESBL-producing isolates of K. pneumoniae were collected from nine hospitals in China from October 2007 to October 2008. Isolates were clustered into various clonal groups. The local spread of bla
CTX-M-15 was mainly mediated by one major conjugative plasmid as determined by S1-PFGE and restriction analysis. A 90-kb plasmid belonging to incompatible group FII was the major carrier of bla
CTX-M-15 in K. pneumoniae. Except bla
TEM-1, the resistance genes such as bla
SHV, bla
DHA-1, bla
OXA-1, qnrB, qnrS, aac(3)-II, and aac(6′)-Ib were not found in the plasmid. In the comparing of conjugative gene sequence, it is 100% identical with the plasmid pKF3–94, which was found in K. pneumonia from Zhejiang province of china previously.Conclusions
bla
CTX-M-15 was prevalent in K. pneumonia of southern China. The dissemination of bla
CTX-M-15 appeared to be due to the horizontal transfer of a 90-kb epidemic plasmid. |
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