Azlocillin, carbenicillin, cefsulodin, mezlocillin, nocardicin A, piperacillin, pirbenicillin, sulbenicillin, and ticarcillin, but not HR756, showed reduced activity against Pseudomonas aeruginosa strains producing seven types of beta-lactamase.
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Jacoby et al. (1979) studied this question.
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