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Journal of Antimicrobial Chemotherapy (1993) 31, 831-839
© 1993 The British Society for Antimicrobial Chemotherapy

other

Mutator plasmid in a nalidixic acid-resistant strain of Shigella dysenteriae type 1

J. E. Amblera, Y. J. Drabub, P. H. Blakemoreb and R. J. Pinneya

aMicrobiology Section, Department of Pharmaceutics, The School of Pharmacy, University of London, Brunswick Square London WC1N 1AX, UK bMicrobiology Department, North Middlesex Hospital London N18 1QX, UK

Received 19 November 1991; accepted 16 February 1993

A clinical isolate of Shigella dysenteriae from Kashmir, resistant to seven antibacterial agents including nalidixic acid, carried four plasmids, only one of which was transferable by conjugation. This plasmid, designated pYD1, conferred trimethoprim resistance and increased the frequency of mutation to nalidixic acid resistance in recipient strains. Thus, although nalidixic acid resistance was not carried on a transferable plasmid, the presence of pYD1 increased the frequency at which the strain mutated to nalidixic acid resistance


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