Units of aminoglycosides issued from the hospital pharmacy and susceptibilities for Serratia marcescens and Pseudomonas aeruginosa were retrospectively analyzed for the years 1975-82. The use of gentamicin appears to select out for tobramycin-resistant S. marcescens and gentamicin-, tobramycin-susceptible P. aeruginosa; whereas the use of tobramycin appears to select out for gentamicin-, tobramycin-susceptible S. marcescens and gentamicin-resistant P. aeruginosa.
Drug Resistance, Microbial Drug Utilization