Pseudomonas aeruginosa R Factors Determining Gentamicin Plus Carbenicillin Resistance from Patients with Urinary Tract Colonizations

Abstract
R factors determining multiple resistance including both gentamicin and carbenicillin have been identified in high incidence among hospital isolates of Pseudomonas aeruginosa . The factors are readily transmitted to other P. aeruginosa but not to Escherichia coli strains K-12 or C, or to Proteus mirabilis . R factor-containing isolates are predominantly immunotype 7 isolated from urinary sources.