Evaluation of an antibiotics susceptibility testing method on enterobacterales-positive blood Cultures in less than 8 h using the rapid mueller-hinton diffusion method in conjunction with the SIRscan 2000 automatic reading device - ACL en SVSAE Accéder directement au contenu
Article Dans Une Revue Microorganisms Année : 2022

Evaluation of an antibiotics susceptibility testing method on enterobacterales-positive blood Cultures in less than 8 h using the rapid mueller-hinton diffusion method in conjunction with the SIRscan 2000 automatic reading device

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Enterobacterales bloodstream infections are life-threatening and require rapid, targeted antibiotherapy based on antibiotic susceptibility testing (AST). A new method using Muller-Hinton Rapid-SIR (MHR-SIR) agar (i2a, Montpellier, France) allows complete direct AST (dAST) to be read from positive blood culture bottles (BCBs) for all Enterobacterales species after 6-8 h of incubation. We evaluated (i) the performance of dAST from positive BCBs on MHR-SIR agar using two different inoculum protocols; (ii) the categorical agreement between dAST results obtained with MHR-SIR agar vs. those obtained with Muller-Hinton (MH) agar; and (iii) the ability of the MHR-SIR medium to detect beta-lactam resistant Enterobacterales. Finally, we estimated the saved turnaround time (TAT) with MHR-SIR compared with MH agar in our 24/7 laboratory. Our results showed that the most suitable inoculation protocol for dAST on MHR-SIR agar was 1 drop of BCB/5 mL H2O. For monomicrobial Enterobacterales BCBs, dAST performed on MHR-SIR medium showed 99.3% categorical agreement with AST on MH agar. Furthermore, MHR-SIR agar allows early detection of beta-lactam resistance mechanisms, including AmpC hyperproduction, extended-spectrum beta-lactamase, and carbapenemase. Finally, TAT reduction in our 24/7 laboratory was 16 h, enabling a significantly faster provision of antibiotic advice.
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hal-03870270 , version 1 (24-11-2022)

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Mathilde Payen, Alice Gaudart, Kevin Legueult, James Kasprzak, Audrey Emery, et al.. Evaluation of an antibiotics susceptibility testing method on enterobacterales-positive blood Cultures in less than 8 h using the rapid mueller-hinton diffusion method in conjunction with the SIRscan 2000 automatic reading device. Microorganisms, 2022, 10 (7), pp.1-15/1377. ⟨10.3390/microorganisms10071377⟩. ⟨hal-03870270⟩
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