Evaluation of gradient diffusion in vitro susceptibility testing of Aerococcus urinae.
J Glob Antimicrob Resist
; 38: 389-400, 2024 Sep.
Article
en En
| MEDLINE
| ID: mdl-39117144
ABSTRACT
OBJECTIVE:
Aerococcus urinae antimicrobial susceptibility testing can be performed via broth microdilution with Mueller-Hinton broth supplemented with lysed horse blood. We sought to compare this with the commonly used gradient diffusion method.METHODS:
We compared broth microdilution with Mueller-Hinton broth supplemented with lysed horse blood and gradient diffusion via Mueller-Hinton agar supplemented with sheep blood for 190 A. urinae isolates against 16 antimicrobials.RESULTS:
No antimicrobials demonstrated more than 90% essential and categorical agreement, and fewer than 3% demonstrated major and very major error rates. Trimethoprim-sulfamethoxazole demonstrated an 81% major error rate and ceftriaxone demonstrated a 76% very major error rate. Agar dilution with lysed horse blood was performed for trimethoprim-sulfamethoxazole against 94 isolates and showed 100% susceptibility, consistent with previous studies.CONCLUSIONS:
Given its limitations in detecting resistant strains, our findings cannot support the routine use of gradient diffusion with Mueller-Hinton agar supplemented with sheep blood for A. urinae in lieu of the Clinical and Laboratory Standards Institute method. Our results suggest that A. urinae is usually susceptible to penicillin, linezolid, tetracycline, and vancomycin. Future studies should evaluate alternative testing methods for clinical microbiology laboratories.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Pruebas de Sensibilidad Microbiana
/
Aerococcus
/
Antibacterianos
Límite:
Animals
/
Humans
Idioma:
En
Revista:
J Glob Antimicrob Resist
Año:
2024
Tipo del documento:
Article
Pais de publicación:
Países Bajos