30 August 2012
A step towards the discrimination of beta-lactamase-producing clinical isolates of Enterobacteriaceae and Pseudomonas aeruginosa by MALDI-TOF mass spectrometryReiner SchaumannABDEFG, Nicolas KnoopABDEF, Gelimer H. GenzelEF, Kevin LosenskyB, Christiane RosenkranzB, Catalina S. StînguB, Wolfgang SchellenbergerCD, Arne C. RodloffAEG, Klaus EschrichBCDEFG
Med Sci Monit 2012; 18(9): MT71-77
Background: Matrix-Assisted Laser-Desorption/Ionization Time of Flight Mass Spectrometry (MALDI-TOF MS) has already proven to be a powerful tool for species identification in microbiological laboratories. As adequate and rapid screening methods for antibiotic resistance are crucially needed, the present study investigated the discrimination potential of MALDI-TOF MS among extended-spectrum-beta-lactamase (ESBL) or metallo-beta-lactamases- (MBL) producing and the nonproducing strains of Escherichia coli (n=19), Klebsiella pneumoniae (n=19), and Pseudomonas aeruginosa (n=38), respectively.
Material/Methods: We used a MALDI-TOF MS protocol, usually applied for species identification, in order to integrate a screening method for beta-lactamases into the routine species identification workflow. The acquired spectra were analyzed by visual inspection, statistical similarity analysis and support vector machine (SVM) classification algorithms.
Results: Neither visual inspection nor mathematical similarity analysis allowed discrimination between spectra of beta-lactamase-producing and the nonproducing strains, but classification within a species by SVM-based algorithms could achieve a correct classification rate of up to 70%.
Conclusions: This shows that MALDI-TOF MS has definite potential to discriminate antibiotic-resistant strains due to ESBL and MBL production from nonproducing strains, but this performance is not yet sufficiently reliable for routine microbiological diagnostics.
Keywords: Species Specificity, Pseudomonas aeruginosa - isolation & purification, Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization - methods, Klebsiella pneumoniae - isolation & purification, Escherichia coli - isolation & purification, Drug Resistance, Bacterial - genetics, Cluster Analysis, Bacterial Infections - microbiology, beta-Lactamases - metabolism
01 November 2023 : EditorialEditorial: Factors Driving New Variants of SARS-CoV-2, Immune Escape, and Resistance to Antiviral Treatments as the End of the COVID-19 Pandemic is Declared
Med Sci Monit 2023; 29:e942960
30 Nov 2023 : Review articleDecoding the Neurological Sequelae of General Anesthesia: A Review
Med Sci Monit In Press; DOI: 10.12659/MSM.942740
30 Nov 2023 : Clinical ResearchEnhanced Pain Relief and Muscle Growth in Individuals with Low Back Instability: The Impact of Blood Flow R...
Med Sci Monit In Press; DOI: 10.12659/MSM.942508
29 Nov 2023 : Clinical ResearchComparative Analysis of Intramedullary Nail versus Plate Fixation for Fibula Fracture in Supination Externa...
Med Sci Monit In Press; DOI: 10.12659/MSM.941909
Most Viewed Current Articles
13 Nov 2021 : Clinical ResearchAcceptance of COVID-19 Vaccination and Its Associated Factors Among Cancer Patients Attending the Oncology ...
Med Sci Monit 2021; 27:e932788
30 Dec 2021 : Clinical ResearchRetrospective Study of Outcomes and Hospitalization Rates of Patients in Italy with a Confirmed Diagnosis o...
Med Sci Monit 2021; 27:e935379
14 Dec 2022 : Clinical ResearchPrevalence and Variability of Allergen-Specific Immunoglobulin E in Patients with Elevated Tryptase Levels
Med Sci Monit 2022; 28:e937990
08 Mar 2022 : Review articleA Review of the Potential Roles of Antioxidant and Anti-Inflammatory Pharmacological Approaches for the Man...
Med Sci Monit 2022; 28:e936292