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Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...

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Increased Azithromycin Susceptibility of Multidrug-Resistant Gram-Negative Bacteria on RPMI-1640 Agar Assessed by

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Optimizing antimicrobial susceptibility testing (AST) for macrolides on RPMI-1640 agar improves detection of Gram-negative bacterial susceptibility. This facilitates identifying new therapeutic options for multidrug-resistant infections.

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EnterobacteriaceaeGram-negativeMICPseudomonas aeruginosaazithromycindisk diffusionmultidrug-resistantsusceptibility testing

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Area of Science:

  • Clinical Microbiology
  • Infectious Diseases
  • Pharmacology

Background:

  • Rising antibiotic resistance and a scarcity of novel antibiotics challenge the treatment of Gram-negative bacterial infections.
  • Macrolides are typically not used for Gram-negative bacteria due to insufficient evidence of in vitro effectiveness.
  • Previous studies indicated Pseudomonas spp. susceptibility to macrolides in RPMI-1640 medium, with clinical data suggesting improved patient outcomes.

Purpose of the Study:

  • To optimize and compare broth microdilution and disk diffusion antimicrobial susceptibility testing (AST) for macrolides against Gram-negative bacteria.
  • To evaluate the utility of RPMI-1640 agar for routine AST of macrolides in a clinical diagnostic setting.

Main Methods:

  • Optimized and compared broth microdilution and disk diffusion AST methods.
  • Tested multidrug-resistant Gram-negative bacteria (Escherichia coli, Enterobacter cloacae, Klebsiella pneumoniae, Pseudomonas aeruginosa) for azithromycin susceptibility.
  • Utilized Mueller-Hinton and RPMI-1640 media for testing.

Main Results:

  • Azithromycin susceptibility for Enterobacteriaceae and a subset of P. aeruginosa was significantly higher on RPMI-1640 agar compared to Mueller-Hinton agar.
  • A significant correlation between zone diameters (disk diffusion) and minimal inhibitory concentrations (MICs) was observed on RPMI-1640 agar for E. coli, E. cloacae, and P. aeruginosa.
  • The optimized disk diffusion AST on RPMI-1640 agar demonstrated potential for routine clinical application.

Conclusions:

  • Routine disk diffusion AST performed on RPMI-1640 agar can enhance the identification of macrolide susceptibility in Gram-negative bacteria.
  • This approach may reveal additional therapeutic strategies for treating multidrug-resistant bacterial infections in clinical settings.
  • Further validation could establish RPMI-1640 agar as a standard medium for macrolide AST.