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DOI: 10.1177/000992288302200907 Moxalactam-tobramycin-resistant Pseudomonas aeruginosa Isolates in Patients with Cystic FibrosisEudowood Pulmonary Division and Cystic Fibrosis Center, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
Eudowood Pulmonary Division and Cystic Fibrosis Center, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland In vitro studies have shown synergistic killing activity against Pseudomonas aeruginosa (PA) with the combination of an aminoglycoside and moxalactam, a new beta-lactam agent. We describe three patients with cystic fibrosis (CF) with PA isolates that were resistant to all single-agent antibiotics, but sensitive to the combination of moxalactam-tobramycin. Initially, all patients had a good clinical response to this combination. However, during a second course of therapy, there was clinical deterioration coincident with the rapid emergence of moxalactam-tobramycin-resistant PA isolates.
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