Activity of eight aminoglycosides against isolates of Serratia marcescens from four hospitals

Abstract
The susceptibility to 8 aminoglycosides of 146 clinical isolates of Serratia marcescens from 4 different hospitals, has been determined. Most isolates were multiply resistant: namely 62% to carbenicillin, 79% to kanamycin, 59% to streptomycin, 56% to gentamicin and sisomicin, and 5% to tobramycin. All strains were susceptible to amikacin and netilmicin. The predominant profile of resistance to aminoglycosides was simultaneous resistance to streptomicin-kanamycin-paromomycin and sisomicin. Transfer experiments confirmed that the resistance to these drugs was plasmid-mediated.

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