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The Journal of Medical Microbiology, Vol 34, Issue 3 149-151, Copyright © 1991 by Society for General Microbiology

JOURNAL ARTICLE

Role of a large plasmid of Salmonella typhi encoding multiple drug resistance

S. Karmaker, D. Biswas, N. M. Shaikh, S. K. Chatterjee, V. K. Kataria and R. Kumar
National Institute of Cholera and Enteric Diseases, Calcutta, India.

Twenty isolates of Salmonella typhi from cases of typhoid during the 1989-1990 epidemic in Calcutta were examined. Most isolates (84% of all isolates in the epidemic) were resistant to chloramphenicol, ampicillin, tetracycline and streptomycin but were sensitive to nalidixic acid and ciprofloxacin. Plasmids of 120 kb and 14 kb were identified amongst the multi-drug resistant isolates of S. typhi. However, there was no plasmid in the antibiotic-sensitive isolates. The 120-kb plasmid was transferable and transconjugants were resistant to chloramphenicol, ampicillin, tetracycline and streptomycin. Restriction endonuclease analysis patterns after EcoRI digestion of the 120-kb antibiotic-resistance plasmids from the S. typhi isolates and transconjugants were similar.


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