β-lactamase-mediated resistance in MDR-Pseudomonas aeruginosa from Qatar

Antimicrobial Resistance & Infection Control

Ali A. Sultan¹  Ali S. Omrani²  Emad Bashir Ibrahim³  Mazen A. Sid Ahmed⁴  Bo Söderquist⁵  Faisal Ahmad Khan⁶  Jana Jass⁶ 

[1] Department of Microbiology and Immunology, Weill Cornell Medicine-Qatar, Doha, Qatar;Division of Infectious Diseases, Department of Medicine, Hamad Medical Corporation, Doha, Qatar;Communicable Diseases Center, Hamad Medical Corporation, Doha, Qatar;Division of Microbiology, Department of Laboratory Medicine and Pathology, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar;Department of Microbiology and Immunology, Weill Cornell Medicine-Qatar, Doha, Qatar;Division of Microbiology, Department of Laboratory Medicine and Pathology, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar;The Life Science Centre - Biology, School of Science and Technology, Orebro University, Orebro, Sweden;School of Medical Sciences, Faculty of Medicine and Health, Orebro University, Orebro, Sweden;The Life Science Centre - Biology, School of Science and Technology, Orebro University, Orebro, Sweden;

关键词: Beta-lactamases;    MDR;    P. aeruginosa;    ST235;   

DOI  :  10.1186/s13756-020-00838-y

来源: Springer

【 摘 要 】

BackgroundThe distribution of β-lactam resistance genes in P. aeruginosa is often closely related to the distribution of certain high-risk international clones. We used whole-genome sequencing (WGS) to identify the predominant sequence types (ST) and β-lactamase genes in clinical isolates of multidrug-resistant (MDR)-P. aeruginosa from QatarMethodsMicrobiological identification and susceptibility tests were performed by automated BD Phoenix™ system and manual Liofilchem MIC Test Strips.ResultsAmong 75 MDR-P. aeruginosa isolates; the largest proportions of susceptibility were to ceftazidime-avibactam (n = 36, 48%), followed by ceftolozane-tazobactam (30, 40%), ceftazidime (n = 21, 28%) and aztreonam (n = 16, 21.3%). All isolates possessed Class C and/or Class D β-lactamases (n = 72, 96% each), while metallo-β-lactamases were detected in 20 (26.7%) isolates. Eight (40%) metallo-β-lactamase producers were susceptible to aztreonam and did not produce any concomitant extended-spectrum β-lactamases. High risk ST235 (n = 16, 21.3%), ST357 (n = 8, 10.7%), ST389 and ST1284 (6, 8% each) were most frequent. Nearly all ST235 isolates (15/16; 93.8%) were resistant to all tested β-lactams.ConclusionMDR-P. aeruginosa isolates from Qatar are highly resistant to antipseudomonal β-lactams. High-risk STs are predominant in Qatar and their associated MDR phenotypes are a cause for considerable concern.

【 授权许可】

CC BY