The in vitro sensitivity of 300 nosocomial strains of Pseudomonas aeruginosa to ceftazidime was compared with their sensitivities to eleven other beta-lactam antibiotics. Concentrations of 2 mg/l of ceftazidime were sufficient to inhibit all of the strains tested including the carbenicillin-resistant ones. Ceftazidime shows considerably greater activity against Ps. aeruginosa than the other beta-lactam antibiotics.
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