Activity of #imipenem / #relebactam against a large collection of #Pseudomonas aeruginosa #clinical isolates and isogenic β-lactam resistant mutants (Antimicrob Agents Chemother., abstract)

[Source: Antimicrobial Agents and Chemotherapy, full page: (LINK). Abstract, edited.]

Activity of imipenem/relebactam against a large collection of Pseudomonas aeruginosa clinical isolates and isogenic β-lactam resistant mutants

Pablo Fraile-Ribot, Laura Zamorano, Rocío Orellana, Ester del Barrio-Tofiño, Irina Sánchez-Diener, Sara Cortes-Lara, Carla López-Causapé, Gabriel Cabot, Germán Bou, Luis Martínez-Martínez, Antonio Oliver,  and on behalf of GEMARA-SEIMC/REIPI Pseudomonas study Group

DOI: 10.1128/AAC.02165-19



Imipenem and Imipenem/relebactam MICs were determined for 1,445 P. aeruginosa clinical isolates and a large panel of isogenic mutants showing the most relevant mutation-driven β-lactam resistance mechanisms. Imipenem/relebactam showed highest susceptibility rates (97.3%), followed by colistin and ceftolozane/tazobactam (both 94.6%). Imipenem/relebactam MICs remained ≤2 μg/mL in all 16 isogenic PAO1 mutants and in 8 pairs of XDR clinical strains that had developed resistance to ceftolozane/tazobactam and ceftazidime/avibactam due to mutations in OXA-10 or AmpC.

Copyright © 2019 American Society for Microbiology. All Rights Reserved.

Keywords: Antibiotics; Drugs Resistance; Pseudomonas aeruginosa; Imipenem; Relebactam.


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Giuseppe Michieli

I am an Italian blogger, active since 2005 with main focus on emerging infectious diseases such as avian influenza, SARS, antibiotics resistance, and many other global Health issues. Other fields of interest are: climate change, global warming, geological and biological sciences. My activity consists mainly in collection and analysis of news, public services updates, confronting sources and making decision about what are the 'signals' of an impending crisis (an outbreak, for example). When a signal is detected, I follow traces during the entire course of an event. I started in 2005 my blog ''A TIME'S MEMORY'', now with more than 40,000 posts and 3 millions of web interactions. Subsequently I added an Italian Language blog, then discontinued because of very low traffic and interest. I contributed for seven years to a public forum ( in the midst of the Ebola epidemic in West Africa in 2014, I left the site to continue alone my data tracking job.