Temocillin against Enterobacteriaceae isolates from community-acquired urinary tract infections: low rate of resistance and good accuracy of routine susceptibility testing methods

• Published in: Journal of antimicrobial chemotherapy 2018-07, Vol.73 (7), p.1848-1853
• Main Authors: Alexandre, K, Réveillon-Istin, M, Fabre, R, Delbos, V, Etienne, M, Pestel-Caron, M, Dahyot, S, Caron, F
• Format: Article
• Language: English
• Subjects: Bacteriology; Life Sciences; Microbiology and Parasitology
• ISSN: 0305-7453; 1460-2091
• DOI: 10.1093/jac/dky101

Abstract Background Temocillin is an old ‘revived’ antibiotic that may play an important role in the treatment of febrile urinary tract infection (UTI). Data regarding its activity against current Enterobacteriaceae isolates as well as the performance of routine susceptibility testing methods are, however, scarce. Objectives To determine the MICs of temocillin for Enterobacteriaceae strains reflecting the current epidemiology and to analyse the accuracy of three commercial methods. Methods Enterobacteriaceae isolates causing community-acquired UTI were prospectively collected from September 2015 to January 2017 in two French centres. Temocillin MIC was determined by agar dilution (AD) as the reference method and then compared with: (i) susceptibility testing by disc diffusion; (ii) MIC determination by Etest; and (iii) MIC estimation by the Vitek 2 automated system. Results A total of 762 Enterobacteriaceae were analysed comprising 658 (86.4%) Escherichia coli and 37 (4.9%) ESBL-producing isolates. Susceptibility rate assessed by AD was 99.6% according to the 8 mg/L clinical breakpoint and was significantly lower against the ESBL-producing isolates than the non-ESBL-producing isolates (94.6% versus 99.9%, P