ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (1): 172-176.doi: 10.11843/j.issn.0366-6964.2016.01.023

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Fitness Cost of a Multidrug Plasmid Carrying blaCTX-M-65rmtB,and fosA3

HE Liang-ying#,LIU Lan-ping#,ZENG Zhen-ling,LIU Jian-hua*   

  1. (College of Veterinary Medicine,South China Agricultural University,Guangzhou 510642,China)
  • Received:2015-02-16 Online:2016-01-23 Published:2016-01-23

Abstract:

The objective of this study was to examine the fitness cost of a multidrug plasmid pHN7A8 carrying blaCTX-M-65rmtB,and fosA3.Plasmid pHN7A8 carrying blaCTX-M-65rmtB,and fosA3 from E.coli 7A8 was transferred into E.coli JM109 by electroporation.Transformant 7A8JT containing pHN7A8 was obtained.Growth curve and growth competition experiments were performed to assess the fitness cost of pHN7A8 upon its host.Growth curve showed no significant difference between the transformant carrying pHN7A8 and sensitive recipient E.coli JM109.Competition experiments between E.coli JM109 strain and transformant 7A8JT revealed a competitive advantage for the transformant versus the recipient.The results showed that no fitness cost was observed for plasmid pHN7A8.More attention should be taken into account the effect of the clinical use of antibiotics on the selection of multidrug resistance encoding plasmids.

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