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Journal of Antimicrobial Chemotherapy (2000) 46, 1013-1016
© 2000 The British Society for Antimicrobial Chemotherapy

Brief report

Pheromone responses and high-level aminoglycoside resistance of conjugative plasmids of Enterococcus faecalis from Greece

S. Pournarasa, A. Tsakrisb,*, M.-F. I. Palepouc, A. Papab, J. Douboyasa, A. Antoniadisb and N. Woodfordc

a Department of Microbiology, AHEPA University Hospital, 54 636 Thessaloniki, Greece; b Department of Microbiology, Medical School, Aristotle University of Thessaloniki, 54 006 Thessaloniki, Greece; c Antibiotic Resistance Monitoring and Reference Laboratory, Central Public Health Laboratory, London NW9 5HT, UK

Fifteen of 22 clinical isolates of Enterococcus faecalis with high-level aminoglycoside resistance isolated in Greece, which were tested for mating ability, co-transferred pheromone response genes together with aminoglycoside resistance determinants to a sensitive recipient strain. Nine of them belonged to the same pulsotype, while the remaining six isolates were genetically unrelated. The prgB gene, which encodes aggregation substance, was detected in all the clinical isolates and transconjugants by both PCR and DNA hybridization but prgA, which encodes the surface exclusion protein, was only detected in two isolates, whereas it is present in most pheromone response plasmids from other sources.

* Corresponding author. Tel: +30-31-999-091; Fax: +30-31-999-149; E-mail: atsakris{at}med.auth.gr


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