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Antibiotic resistance ofPseudomonas aeruginosa colonizing a urinary catheter in vitro

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Abstract

A modified Robbins Device was used to establish coherent biofilms ofPseudomonas aeruginosa on the surface of catheter material in an artificial urine milieu and the ability of an antibiotic to penetrate the biofilm and kill the enclosed bacteria was assessed. ThePseudomonas aeruginosa strain used had been isolated from a patient with urinary tract infection. Although planktonic (floating) cells of thePseudomonas aeruginosa strain were inhibited by less than 1 mg/l of tobramycin and killed by 50 mg/l, contact with 1,000 mg/l of tobramycin for 12 h failed to kill all the sessile (adherent) bacteria in the biofilms on the surface of the catheter material. Surviving sessile bacteria recovered directly from the exposure to 1,000 mg/l of tobramycin were inhibited by 0.4 mg/l of this agent when tested as dispersed planktonic cells by standard MIC methods. It is suggested that growth within thick adherent biofilms confers upon cells ofPseudomonas aeruginosa a large measure of resistance to aminoglycosides and other antibiotics that may help to explain the frequent failure of antibiotic chemotherapy in catheter-associated urinary tract infections.

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Authors and Affiliations

  1. Department of Urology, Queen's University, K7L 2V7, Kingston, Ontario, Canada

    J. C. Nickel

  2. Department of Biology, University of Calgary, B3H 1V8, Calgary, Alberta, Canada

    J. B. Wright, I. Ruseska, C. Whitfield & J. W. Costerton

  3. Medical Microbiology, Dalhousie University, B3H 1V8, Halifax, Nova Scotia, Canada

    T. J. Marrie

Authors
  1. J. C. Nickel
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  2. J. B. Wright
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  3. I. Ruseska
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  4. T. J. Marrie
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  5. C. Whitfield
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  6. J. W. Costerton
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Nickel, J.C., Wright, J.B., Ruseska, I. et al. Antibiotic resistance ofPseudomonas aeruginosa colonizing a urinary catheter in vitro. Eur. J, Clin. Microbiol. 4, 213–218 (1985). https://doi.org/10.1007/BF02013600

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