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Article
Distribution of the Multidrug Resistance Gene cfr in Staphylococcus Species Isolates from Swine Farms in China
Antimicrobial Agents and Chemotherapy
  • Yang Wang, China Agricultural University
  • Wanjiang Zhang, China Agricultural University
  • Juan Wang, China Institute of Veterinary Drugs Control, Beijing
  • Congming Wu, China Agricultural University
  • Zhangqi Shen, Iowa State University
  • Xiao Fu, China Agricultural University
  • Yang Yan, China Agricultural University
  • Qijing Zhang, Iowa State University
  • Stefan Schwarz, Friedrich-Loeffler-Institut
  • Jianzhong Shen, China Agricultural University
Document Type
Article
Publication Version
Published Version
Publication Date
3-1-2012
DOI
10.1128/AAC.05827-11
Abstract

A total of 149 porcine Staphylococcus isolates with florfenicol MICs of ≥16 μg/ml were screened for the presence of the multiresistance gene cfr, its location on plasmids, and its genetic environment. In total, 125 isolates carried either cfr (16 isolates), fexA (92 isolates), or both genes (17 isolates). The 33 cfr-carrying staphylococci, which included isolates of the species Staphylococcus cohnii, S. arlettae, and S. saprophyticus in which the cfr gene has not been described before, exhibited a wide variety of SmaI pulsed-field gel electrophoresis patterns. In 18 cases, the cfr gene was located on plasmids. Four different types of cfr-carrying plasmids—pSS-01 (n = 2; 40 kb), pSS-02 (n = 3; 35.4 kb), pSS-03 (n = 10; 7.1 kb), and pBS-01 (n = 3; 16.4 kb)—were differentiated on the basis of their sizes, restriction patterns, and additional resistance genes. Sequence analysis revealed that in plasmid pSS-01, the cfr gene was flanked in the upstream part by a complete aacA-aphD-carrying Tn4001-like transposon and in the downstream part by a complete fexA-carrying transposon Tn558. In plasmid pSS-02, an insertion sequence IS21-558 and the cfr gene were integrated into transposon Tn558 and thereby truncated the tnpA and tnpB genes. The smallest cfr-carrying plasmid pSS-03 carried the macrolide-lincosamide-streptogramin B resistance gene erm(C). Plasmid pBS-01, previously described in Bacillus spp., harbored a Tn917-like transposon, including the macrolide-lincosamide-streptogramin B resistance gene erm(B) in the cfr downstream region. Plasmids, which in part carry additional resistance genes, seem to play an important role in the dissemination of the gene cfr among porcine staphylococci.

Comments

This article is published as Wang, Yang, Wanjiang Zhang, Juan Wang, Congming Wu, Zhangqi Shen, Xiao Fu, Yang Yan, Qijing Zhang, Stefan Schwarz, and Jianzhong Shen. "Distribution of the multidrug resistance gene cfr in Staphylococcus species isolates from swine farms in China." Antimicrobial agents and chemotherapy 56, no. 3 (2012): 1485-1490. doi: 10.1128/AAC.05827-11. Posted with permission.

Copyright Owner
American Society for Microbiology
Language
en
File Format
application/pdf
Citation Information
Yang Wang, Wanjiang Zhang, Juan Wang, Congming Wu, et al.. "Distribution of the Multidrug Resistance Gene cfr in Staphylococcus Species Isolates from Swine Farms in China" Antimicrobial Agents and Chemotherapy Vol. 56 Iss. 3 (2012) p. 1485 - 1490
Available at: http://works.bepress.com/qijing-zhang/63/