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  • Title: Cost-effective implementation of a custom MALDI-TOF library for the identification of South Australian Nocardia isolates.
    Author: Forero Morales MP, Hopprich R, Wise R, Shephard L, Weldhagen GF.
    Journal: Pathology; 2018 Dec; 50(7):753-757. PubMed ID: 30482608.
    Abstract:
    Mass spectrometry plays a significant role in the routine identification of micro-organisms and provides the ability to incorporate newly found pathogens into the database in a cost-effective fashion. This work aims to highlight the role of mass spectrometry through improved identification of Nocardia species in a diagnostic clinical microbiology laboratory. Prior to this study we constructed a custom in-house matrix-assisted laser desorption ionisation-time of flight (MALDI-TOF) library for Nocardia isolates consisting of isolates identified to the species level. Subsequently over a period of 5 years, we isolated a further 153 Nocardia clinical isolates, of which 91.5% (140/153) were identified correctly with the custom MALDI-TOF library and 8.5% (13/153) needed further molecular sequencing for final identification. We estimate our cost savings to be approximately 9,800 AUD overall with this implementation over the study period. Continued expansion and maintenance of this custom library will eventually result in little or no 16S ribosomal DNA sequencing needed for specific identification of Nocardia isolates.
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