Interactions of Antimicrobial Drugs and Combined Phagocytic/Serum Bactericidal Activity of Defibrinated Human Blood against Serratia marcescens
- 1 January 1982
- journal article
- research article
- Published by S. Karger AG in Chemotherapy
- Vol. 28 (5) , 369-380
- https://doi.org/10.1159/000238125
Abstract
Minimal bactericidal concentrations of trimethoprim, nalidixic acid and nitrofurantoin revealed effective intraphagolysosomal bacterial activity against several assay strains of S. marcescens as determined with phenylbutazone-treated (2 mg/ml) fresh defibrinated huan blood (55 vol %), following killing of extraphagocytic test bacteria with group A (phage tail) bacteriocins of S. marcescens. The degree of intraphagocytic killing activity of trimethoprim, nalidixic acid and nitrofurantoin approximated that of rifampin. Inhibitory and subinhibitory concentations of cotrimoxazole or trimethoprim combined with 55 vol % of defibrinated blood, respectively, yielded additive effects against all test strains of S. marcescens. Combinations of nalidixic acid and nitrofurantoin with blood, respectively, resulted in essentially indifferent effects against S. marcescens.Keywords
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