Sensitivity Studies on Serratia Strains from Clinical Specimens

Abstract

Sensitivities of 50 S. marcescens strains against 17 antimicrobial agents were determined by means of a single high potency disk and a plate dilution test. All were sensitive to kanamycin and neomycin, and 48 also to nalidixic acid. Multiple resistance to other drugs (streptomycin, sulfadiazine, nitrofurantoin, chloramphenicol) was frequent; tetracycline and ampicillin were always ineffective. Pigmented strains were more sensitive than nonpigmented ones. Results of the 2 methods are correlated, compared with those of other authors and evaluated as to their implications for bacteriological diagnosis and clinical therapy.