Antagonistic Effect of Calcium in Serum on the Activity of Tobramycin Against Pseudomonas

Author:

Davis Starkey D.1,Iannetta Antoinette1

Affiliation:

1. Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington 98105

Abstract

Physiological concentrations of calcium in serum antagonize the activities of colistin, polymyxin B, and gentamicin against Pseudomonas aeruginosa . Studies were carried out to determine whether tobramycin, a new aminoglycoside antibiotic, is also antagonized by calcium. The activity of tobramycin in vitro was shown to be antagonized by human serum and by physiological concentrations of calcium. The addition of human serum in broth-dilution tests produced a fourfold rise in the minimal inhibitory concentrations of tobramycin for five strains of Pseudomonas . In disc diffusion tests, the addition of calcium to the agar significantly decreased the size of inhibition zones, and the addition of a chelating agent to the agar increased the zone sizes. In a limited comparative study, tobramycin and gentamicin were tested against both light and heavy bacterial inocula of two strains of Pseudomonas . Tobramycin appeared to be antagonized less by serum than was gentamicin at equal antibiotic concentrations.

Publisher

American Society for Microbiology

Subject

Infectious Diseases,Pharmacology (medical),Pharmacology

Reference8 articles.

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