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Measuring individual colony MICs is a more sensitive method to detect the effect of antimicrobials on antimicrobial susceptibility than the proportion of colonies resistant
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Measuring individual colony MICs is a more sensitive method to detect the effect of antimicrobials on antimicrobial susceptibility than the proportion of colonies resistant
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Journal Article
Measuring individual colony MICs is a more sensitive method to detect the effect of antimicrobials on antimicrobial susceptibility than the proportion of colonies resistant
2024
Overview
Abstract
The ResistAZM randomized controlled trial found that the receipt of ceftriaxone/azithromycin, compared to ceftriaxone was not associated with an increase in the proportion of oral commensal Neisseria spp. and streptococci with azithromycin resistance 14 days after treatment. We repeated the analyses by measuring the minimum inhibitory concentrations (MICs) of azithromycin and ceftriaxone for individual colonies of commensal Neisseria spp. and streptococci at day 0 and day 14 in both arms. The receipt of ceftriaxone/azithromycin but not ceftriaxone was associated with an increase in azithromycin MIC for both Neisseria spp. (P < 0.0001) and streptococci (P = 0.0076). Likewise, ceftriaxone/azithromycin but not ceftriaxone monotherapy was associated with an increase in ceftriaxone MICs in Neisseria spp. (P = 0.0035). Whereas the proportion method failed to detect an association between the receipt of azithromycin and increased macrolide resistance, the MIC distribution method detected this effect. The MIC distribution method is thus a more sensitive method to assess the effect of antimicrobials on antimicrobial susceptibility. Background: The ResistAZM randomized controlled trial found that the receipt of ceftriaxone/azithromycin, compared to ceftriaxone was not associated with an increase in the proportion of oral commensal Neisseria spp. and streptococci with azithromycin resistance 14 days after treatment. Methods: We repeated the analyses by measuring the minimum inhibitory concentrations (MICs) of azithromycin and ceftriaxone for individual colonies of commensal Neisseria spp. and streptococci at day 0 and day 14 in both arms. Results: The receipt of ceftriaxone/azithromycin but not ceftriaxone was associated with an increase in azithromycin MIC for both Neisseria spp. (P < 0.0001) and streptococci (P = 0.0076). Likewise, ceftriaxone/azithromycin but not ceftriaxone monotherapy was associated with an increase in ceftriaxone MICs in Neisseria spp. (P = 0.0035). Conclusions: Whereas the proportion method failed to detect an association between the receipt of azithromycin and increased macrolide resistance, the MIC distribution method detected this effect. The MIC distribution method is thus a more sensitive method to assess the effect of antimicrobials on antimicrobial susceptibility.
The MIC distribution method is a more sensitive method to assess the effect of antimicrobials on antimicrobial susceptibility.
Publisher
Oxford University Press
