[Disc sensitivity test of cefuroxime]

Area of Science:

• Microbiology
• Clinical Pharmacy
• Bacterial Susceptibility Testing

Context:

• Cefuroxime is a crucial cephalosporin antibiotic used to treat various bacterial infections.
• Accurate and rapid determination of bacterial susceptibility to antibiotics is vital for effective treatment.
• The single-disc diffusion method is a common, cost-effective technique for assessing antibiotic susceptibility.

Purpose:

• To evaluate the correlation between the minimum inhibitory concentration (MIC) of cefuroxime determined by the 2-fold agar dilution method and the diameter of the inhibition zone obtained by the single-disc diffusion method.
• To assess the applicability of the single-disc assay for cefuroxime susceptibility testing under different incubation conditions, including rapid assays.

Summary:

• The study tested 124 bacterial strains from 28 species/subspecies against cefuroxime using both agar dilution and single-disc methods.
• A significant correlation was observed between MIC values and inhibition zone diameters across conventional (16-hour), delayed (24-hour), and rapid (3-6 hour) incubation periods.
• Regression equations were derived to predict MIC from inhibition zone diameter for each assay type, demonstrating the disc assay's utility.

Impact:

• The findings validate the single-disc assay as a reliable method for determining cefuroxime susceptibility, offering a faster alternative to traditional dilution methods.
• This can lead to quicker clinical decisions regarding antibiotic therapy, potentially improving patient outcomes.
• The established regression equations provide a quantitative basis for interpreting disc diffusion results for cefuroxime.