Direct identification of clinical pathogens from liquid culture media by MALDI-TOF MS analysis
Oviaño, M. ; Rodríguez-Sánchez, B. ; Gómara, M. (Universidad de Zaragoza) ; Alcalá, L. ; Zvezdanova, E. ; Ruíz, A. ; Velasco, D. ; Gude, M.J. ; Bouza, E. ; Bou, G.
Resumen: Objectives: We propose using MALDI-TOF MS as a tool for identifying microorganisms directly from liquid cultures after enrichment of the clinical sample in the media, to obtain a rapid microbiological diagnosis and an adequate administration of the antibiotic therapy in a clinical setting.
Methods: To evaluate this approach, a series of quality control isolates were grown in thioglycollate (TG) broth and brain heart infusion (BHI) broth and extracted under four different protocols before finally being identified by MALDI-TOF MS. After establishing the best extraction protocol, we validated the method in a total of 300 liquid cultures (150 in TG broth and 150 in BHI broth) of different types of clinical samples obtained from two tertiary Spanish hospitals.
Results: The initial evaluation showed that the extraction protocol including a 5 minute sonication step yielded 100% valid identifications, with an average score value of 2.305. In the clinical validation of the procedure, 98% of the microorganisms identified from the TG broth were correctly identified relative to 97% of those identified from the BHI broth. In 24% of the samples analysed, growth by direct sowing was only successful in the liquid medium, and no growth was observed in the direct solid agar cultures.
Conclusions: Use of MALDI-TOF MS plus the sonication-based extraction method enabled direct and accurate identification of microorganisms in liquid culture media in 15 minutes, in contrast to the 24 hours of subculture required for conventional identification, allowing the administration of a targeted antimicrobial therapy.
Idioma: Inglés
DOI: 10.1016/j.cmi.2017.09.010
Año: 2018
Publicado en: Clinical Microbiology and Infection 24, 6 (2018), 624-629
ISSN: 1198-743X
Factor impacto JCR: 6.425 (2018)
Categ. JCR: MICROBIOLOGY rank: 17 / 133 = 0.128 (2018) - Q1 - T1
Categ. JCR: INFECTIOUS DISEASES rank: 6 / 89 = 0.067 (2018) - Q1 - T1
Factor impacto SCIMAGO: 2.651 - Infectious Diseases (Q1) - Microbiology (medical) (Q1) - Medicine (miscellaneous) (Q1)
Financiación: info:eu-repo/grantAgreement/EUR/ERDF/A way to achieve Europe
Tipo y forma: Artículo (PostPrint)
Área (Departamento): Área Microbiología (Dpto. Microb.Med.Pr.,Sal.Públ.)
Debe reconocer adecuadamente la autoría, proporcionar un enlace a la licencia e indicar si se han realizado cambios. Puede hacerlo de cualquier manera razonable, pero no de una manera que sugiera que tiene el apoyo del licenciador o lo recibe por el uso que hace. No puede utilizar el material para una finalidad comercial. Si remezcla, transforma o crea a partir del material, no puede difundir el material modificado.
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Methods: To evaluate this approach, a series of quality control isolates were grown in thioglycollate (TG) broth and brain heart infusion (BHI) broth and extracted under four different protocols before finally being identified by MALDI-TOF MS. After establishing the best extraction protocol, we validated the method in a total of 300 liquid cultures (150 in TG broth and 150 in BHI broth) of different types of clinical samples obtained from two tertiary Spanish hospitals.
Results: The initial evaluation showed that the extraction protocol including a 5 minute sonication step yielded 100% valid identifications, with an average score value of 2.305. In the clinical validation of the procedure, 98% of the microorganisms identified from the TG broth were correctly identified relative to 97% of those identified from the BHI broth. In 24% of the samples analysed, growth by direct sowing was only successful in the liquid medium, and no growth was observed in the direct solid agar cultures.
Conclusions: Use of MALDI-TOF MS plus the sonication-based extraction method enabled direct and accurate identification of microorganisms in liquid culture media in 15 minutes, in contrast to the 24 hours of subculture required for conventional identification, allowing the administration of a targeted antimicrobial therapy.
Idioma: Inglés
DOI: 10.1016/j.cmi.2017.09.010
Año: 2018
Publicado en: Clinical Microbiology and Infection 24, 6 (2018), 624-629
ISSN: 1198-743X
Factor impacto JCR: 6.425 (2018)
Categ. JCR: MICROBIOLOGY rank: 17 / 133 = 0.128 (2018) - Q1 - T1
Categ. JCR: INFECTIOUS DISEASES rank: 6 / 89 = 0.067 (2018) - Q1 - T1
Factor impacto SCIMAGO: 2.651 - Infectious Diseases (Q1) - Microbiology (medical) (Q1) - Medicine (miscellaneous) (Q1)
Financiación: info:eu-repo/grantAgreement/EUR/ERDF/A way to achieve Europe
Tipo y forma: Artículo (PostPrint)
Área (Departamento): Área Microbiología (Dpto. Microb.Med.Pr.,Sal.Públ.)
Debe reconocer adecuadamente la autoría, proporcionar un enlace a la licencia e indicar si se han realizado cambios. Puede hacerlo de cualquier manera razonable, pero no de una manera que sugiera que tiene el apoyo del licenciador o lo recibe por el uso que hace. No puede utilizar el material para una finalidad comercial. Si remezcla, transforma o crea a partir del material, no puede difundir el material modificado.Exportado de SIDERAL (2019-11-26-13:41:34)
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Registro creado el 2019-05-15, última modificación el 2019-11-26