NDLI: Comparison of gyrA Mutations, Cyclohexane Resistance, and the Presence of Class I Integrons in Salmonella enterica from Farm Animals in England and Wales

Content Provider	PubMed Central
Author	Liebana, Ernesto Carol, Clouting Cassar, Claire A. Randall, Luke P. Walker, Rachel A. Threlfall, E. John Clifton-hadley, Felicity A. Ridley, Anne M. Davies, Robert H.
Copyright Year	2002
Abstract	This study is focused on real-time detection of gyrA mutations and of the presence of class I integrons in a panel of 100 veterinary isolates of Salmonella enterica from farm animals. The isolates were selected on the basis of resistance to nalidixic acid, representing a variety of the most prevalent serotypes in England and Wales. In addition, organic solvent (cyclohexane) resistance in these isolates was investigated in an attempt to elucidate the presence of efflux pump mechanisms. The most prevalent mutation among the isolates studied was Asp87-Asn (n = 42), followed by Ser83-Phe (n = 38), Ser83-Tyr (n = 12), Asp87-Tyr (n = 4), and Asp87-Gly (n = 3). Two distinct subpopulations were identified, separated at the 1-mg/liter breakpoint for ciprofloxacin: 86% of isolates with mutations in codon 83 showed MICs of ≥1 mg/liter, while 89.8% of isolates with mutations in codon 87 presented MICs of ≤0.5 mg/liter. Cyclohexane resistance was more prevalent among Ser83 mutants than among Asp87 mutants (34.7 and 4%, respectively), and in 79% of isolates that presented both gyrA mutations and cyclohexane resistance, the level of ciprofloxacin resistance was ≥2.0 mg/liter. Thirty-four isolates contained class I integrons, with 71% of the S. enterica serovar Typhimurium isolates and 6.9% of isolates belonging to other serotypes containing such elements. The methods used represent sensitive ways of investigating the presence of gyrA mutations and of detecting class-I integrons in Salmonella isolates. The results can be obtained in less than 1 h from single colonies without the need for purifying DNA.
Related Links	http://dx.doi.org/10.1128/jcm.40.4.1481-1486.2002
Ending Page	1486
Page Count	6
Starting Page	1481
File Format	PDF
ISSN	00951137
e-ISSN	1098660X
Journal	Journal of Clinical Microbiology
Issue Number	4
Volume Number	40
Language	English
Publisher	American Society for Microbiology
Publisher Date	2002-04-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Microbiology (medical) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Microbiology (medical)

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