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Applied and Environmental Microbiology, November 1998, p. 4194-4201, Vol. 64, No. 11
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Molecular Characterization of Plasmid-Mediated Oxytetracycline Resistance in Aeromonas salmonicida

C. A. Adams, B. Austin,* P. G. Meaden, and D. McIntoshdagger

Department of Biological Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, Scotland

Received 20 March 1998/Accepted 13 August 1998

Using broth conjugation, we found that 19 of 29 (66%) oxytetracycline (OT)-resistant isolates of Aeromonas salmonicida transferred the OT resistance phenotype to Escherichia coli. The OT resistance phenotype was encoded by high-molecular-weight R-plasmids that were capable of transferring OT resistance to both environmental and clinical isolates of Aeromonas spp. The molecular basis for antibiotic resistance in OT-resistant isolates of A. salmonicida was determined. The OT resistance determinant from one plasmid (pASOT) of A. salmonicida was cloned and used in Southern blotting and hybridization experiments as a probe. The determinant was identified on a 5.4-kb EcoRI fragment on R-plasmids from the 19 OT-resistant isolates of A. salmonicida. Hybridization with plasmids encoding the five classes (classes A to E) of OT resistance determinants demonstrated that the OT resistance plasmids of the 19 A. salmonicida isolates carried the class A resistance determinant. Analysis of data generated from restriction enzyme digests showed that the OT resistance plasmids were not identical; three profiles were characterized, two of which showed a high degree of homology.


* Corresponding author. Mailing address: Department of Biological Sciences, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, United Kingdom. Phone: 44-131-451-3452. Fax: 44-131-451-3009. E-mail: B.Austin{at}hw.ac.uk.

dagger Present address: Departamento de Bioquimica e Biologia Molecular, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, 21045-900, Brazil.


Applied and Environmental Microbiology, November 1998, p. 4194-4201, Vol. 64, No. 11
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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