Temocillin versus carbapenems for urinary tract infection due to ESBL-producing Enterobacteriaceae: a multicenter matched case-control study.

Objectives: To compare the efficacy of temocillin with carbapenems for extended spectrum β-lactamase (ESBL)-producing Enterobacteriaceae urinary tract infections (ESBL-E UTI).

Methods: A multicenter retrospective case-control study of adults with ESBL-E UTI was conducted between January 2015 and October 2019. Cases received temocillin ≥ 50% of the effective antibiotic therapy duration and controls exclusively received carbapenem; they were statistically matched (1:1 ratio) on 6-month period, sex and age. The clinical cure at the end of antibiotic therapy was analysed using conditional logistic regression.

Results: Seventy-two temocillin cases were matched to 72 carbapenem controls. Most (67%) were male, median age was 69.4 years, 81 (56%) were immunocompromised, including 44 (31%) solid organ transplant recipients. There was no difference between cases and controls for baseline characteristics and microorganisms involved: Klebsiella pneumoniae in 59 (41%), Escherichia coli in 57 (40%), and Enterobacter spp. in 24 (17%). The median time from admission to effective antibiotic therapy was 0 days [range, 0-2]. Among cases, first-line antibiotic therapy (≤ 72 hours) was temocillin in six (8%) and carbapenems in 39 (54%). Temocillin was given at the median daily dose of 4 g [range, 2-4] after 3 days [range, 2-5] of carbapenems. Patients received temocillin for 81% [range, 70-93] of the effective antibiotic course duration over 11 days [range, 8-14]. The effective antibiotic duration was similar in cases and controls (P = 0.067). Clinical cure at the end of antibiotic therapy was 94% (68/72) in cases vs. 99% (71/72) in controls (P = 0.206), with no difference among immunocompromised and solid organ transplant patients (P > 0.050).

Conclusions: Temocillin effectively relayed β-lactams, including carbapenems, to treat (complicated) ESBL-E UTI. Its efficacy was consistent among kidney transplant recipients.