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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.
McIntosh
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.

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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