Direct antibiotic susceptibility testing of blood cultures of gram-negative bacilli using the Drug Susceptibility Testing Microfluidic (DSTM) device.
J Infect Chemother
; 26(6): 554-562, 2020 Jun.
Article
en En
| MEDLINE
| ID: mdl-32115345
ABSTRACT
Proper treatment of bloodstream infections requires rapid, early determination of appropriate antibiotic agents, emphasizing the need for more rapid drug susceptibility testing. The Drug Susceptibility Testing Microfluidic (DSTM) device represents a novel method in which a small amount of bacterial suspension is injected into the microchip-like device and cultured for 3 h. However, it remains unknown whether the DSTM method can directly determine antibiotic susceptibilities from positive blood cultures. Here, we developed a new approach to directly assess drug susceptibility, using the DSTM method for positive blood cultures. We compare the utility and accuracy of DSTM with those of conventional susceptibility testing methods. Fifty positive blood cultures identified as gram-negative bacilli were used herein. The outcomes of drug susceptibility and resistance assays for positive blood cultures were compared to those of conventional susceptibility testing methods to evaluate their utility and accuracy. Method agreement rates between DSTM and standard methods often exceed 90%, suggesting a high positive correlation with conventional methods. Furthermore, our results show that a combination of multiple drugs in the DSTM device helps identify extended-spectrum ß-lactamase (ESBL)- and AmpC-ß-lactamase (AmpC-)-producing microorganisms. In conclusion, DSTM method enables effective drug susceptibility and resistance screening within 3 h from positive blood cultures and is suitable for the rapid and personalized determination of the antimicrobial regimen.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Pruebas de Sensibilidad Microbiana
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Dispositivos Laboratorio en un Chip
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Bacterias Gramnegativas
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Antibacterianos
Límite:
Humans
Idioma:
En
Año:
2020
Tipo del documento:
Article