Comparison of two methods skipping cell lysis and protein extraction for identification of bacteria from blood cultures by matrix-assisted laser desorption/ionization time-of-flight mass-spectrometry.
Rev Esp Quimioter
; 32(4): 365-369, 2019 Aug.
Article
em En
| MEDLINE
| ID: mdl-31293114
ABSTRACT
OBJECTIVE:
Matrix-assisted laser desorption/ionization time-of-flight mass-spectrometry (MALDI-TOF MS) is widely used for fast identification of bacteria from blood cultures (BC). We compared the performance of two procedures, one including a pre-enrichment step in brain heart infusion and the other a direct method using vacutainer separator gel tubes (DI), for identification of bacteria from blood cultures by MALDI-TOF MS.METHODS:
We first prepared a training set of 20 simulated bacteremia specimens, including 10 Gram-negative and 10 Gram-positive species. A total of 145 non-consecutive BCs flagged as positive (68 Gram-negative rods, and 77 Gram-positive cocci) were prospectively analyzed (validation set).RESULTS:
A total of 82% and 49% of isolates were correctly identified to the species level by the respective methods.CONCLUSIONS:
The pre-enrichment method outperformed the DI method for identification of virtually all bacterial species included in the panels.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bacteriemia
/
Espectrometria de Massas por Ionização e Dessorção a Laser Assistida por Matriz
/
Hemocultura
/
Bactérias Gram-Negativas
/
Bactérias Gram-Positivas
Tipo de estudo:
Diagnostic_studies
/
Observational_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article