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Ceftolozane-tazobactam (TOL-TAZ) is a novel antibacterial with activity againstPseudomonas aeruginosa and other common Gram-negative pathogens, including extended-spectrum β-lactamase (ESBL)-producingEnterobacteriaceae , that are associated with complicated intra-abdominal infections (cIAIs). This prospective, double-blind, randomized, multicenter, phase II trial assessed patient clinical and microbiological responses to and the safety of TOL-TAZ plus metronidazole compared with those of meropenem. Hospitalized adults with cIAIs that required surgical intervention were randomized (2:1) to receive intravenous (i.v.) TOL-TAZ (1.5 g [containing 1,000 mg TOL and 500 mg TAZ] every 8 h [q8h]) with or without i.v. metronidazole (500 mg q8h) or i.v. meropenem (1 g q8h) for 4 to 7 days. The primary endpoint was the clinical response at the test-of-cure visit in the microbiologically modified intent-to-treat (mMITT) and microbiologically evaluable (ME) populations. Secondary measures included the patients' microbiological response and safety. In total, 82 patients received TOL-TAZ (90.2% with metronidazole), and 39 received meropenem. For the mMITT population, clinical cure was seen in 83.6% of the patients (51/61; 95% confidence interval [CI], 71.9 to 91.8) who received TOL-TAZ and 96.0% of the patients (24/25; 95% CI, 79.6 to 99.9) who received meropenem (difference, −12.4%; 95% CI, −34.9% to 11.1%); in the ME population, clinical cure was seen in 88.7% and 95.8% of the patients (difference, −7.1%; 95% CI, −30.7% to 16.9%) who received TOL-TAZ and meropenem, respectively. TOL-TAZ demonstrated microbiological success againstEscherichia coli (89.5%),Klebsiella pneumoniae (100%), andP. aeruginosa (100%). The adverse event rates were similar in the groups (50.0% with TOL-TAZ and 48.8% with meropenem). TOL-TAZ in combination with metronidazole was well tolerated and resulted in clinical and microbiological success rates supportive of further clinical development in patients with cIAIs. (This study has been registered at ClinicalTrials.gov under registration no. NCT01147640.)

antimicrobial agents and chemotherapy

Multicenter, Double-Blind, Randomized, Phase II Trial To Assess the Safety and Efficacy of Ceftolozane-Tazobactam plus Metronidazole Compared with Meropenem in Adult Patients with Complicated Intra-Abdominal Infections