Comparative susceptibilities of 40 strains of Pseudomonas aeruginosa to 10 antipseudomonal antimicrobial agents.

The in vitro susceptibility of 40 clinical isolates of Pseudomonas aeruginosa to 10 antipseudomonal antibiotics was determined. Of the strains examined, 100, 90, 85 and 80% were susceptible to netilmicin, amikacin, gentamicin and tobramycin, respectively; 93, 85 and 72% were susceptible to piperacillin, azlocillin and carbenicillin, respectively; and 93, 88 and 84% were susceptible to cefotaxime, moxalactam and cefsulodin, respectively. These data confirm that the newer antipseudomonal antimicrobial agents are more effective against Ps. aeruginosa than the older agents.