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Direct identification of pathogens from positive blood cultures by matrix-assisted laser desorption ionization-time of flight mass spectrometry

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Author:
No author available
Journal Title:
中华临床感染病杂志
Issue:
2
DOI:
10.3760/cma.j.issn.1674-2397.2016.02.011
Key Word:
光谱法,质量,基质辅助激光解吸电离;细菌感染;血流感染;诊断;Spectrometry,mass,matrix-assisted laser desorption-ionization;Bacterial infection;Bloodstream infection;Diagnosis

Abstract: Objective To develop a rapid and accurate technique for pathogens identification from positive blood cultures by matrix-assisted laser desorption ionization-time of flight mass spectrometry ( MALDI-TOF MS) .Methods A total of 266 culture-positive blood samples from clinical laboratory in the Second Affiliated Hospital of Soochow University during January to July 2015 were collected.The blood was transferred into separation-gel tubes, and the bacteria were enriched and purified by differential centrifugation.MALDI-TOF MS was applied to identify the bacteria and the results were compared with conventional bacterial culture. Results Among 266 culture-positive blood samples, 260 were monomicrobial cultures and 6 were polymicrobial cultures.Of 260 monomicrobial cultures, 98.8% (257/260) and 96.2% ( 250/260 ) of organisms were identified at the genus level and the species level, respectively.Of 140 Gram-negative bacterial isolates, 99.3% (139/140) and 97.9% (137/140) were identified at the genus level and the species level, respectively.Of 120 Gram-positive bacteria isolates, 98.3%(118/120) and 94.2% (113/120) were identified at the genus level and the species level, respectively.None of the 6 polymicrobial cultures were identified.Conclusion MALDI-TOF MS can directly identify the bacteria from positive blood cultures, which provides a rapid and accurate method for the diagnosis of bloodstream infection.

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