期刊
JOURNAL OF MICROBIOLOGICAL METHODS
卷 212, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mimet.2023.106803
关键词
MALDI-TOF MS; Pseudomonas aeruginosa; Antimicrobial susceptibility; Blood culture; Carbapenem; Meropenem
We developed and evaluated a simple and low-cost method using MALDI-TOF MS to detect MER resistance in Pseudomonas aeruginosa directly from blood. The method correctly classified 88.9% of isolates when tested with BC samples containing 99 P. aeruginosa isolates. It also achieved 100% correct categorization in prospectively collected BC samples.
We developed and evaluated a simple, low-cost matrix-assisted laser desorption/ionization mass spectrometry (MALDI-TOF MS)-based method for the detection of meropenem (MER) resistance in Pseudomonas aeruginosa directly from blood. A volume of 50 & mu;L of positive-flagged blood culture (BC) was transferred in 450 & mu;L brain heart infusion (BHI) broth to microtubes either containing MER (test) or not (control) at 25 or 50 mg/L. P. aeruginosa was categorized as resistant or susceptible on the basis of whether or not the isolates could be identified, respectively, in the presence of the antibiotic (3 h of incubation). When using BCs spiked with 99 P. aeruginosa isolates (64 MER-resistant and 35 MER-susceptible) the method correctly classified 88/99 isolates (88.9%). Correct categorization was achieved in 23/23 (100%) of P. aeruginosa isolates (17 MER-susceptible and 6 MER-resistant) from prospectively collected BCs. Our method may prove useful for early targeted or adjustment of empirical therapy in patients with P. aeruginosa bloodstream infections.
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