Comparative antibiotic sensitivity testing of bacteria with a paper disc and a tablet method

Area of Science:

• Microbiology
• Clinical Diagnostics
• Pharmaceutical Sciences

Background:

• Accurate antibiotic sensitivity testing is crucial for effective treatment of bacterial infections.
• Standardized methods ensure reliable results for clinical decision-making.
• Comparing different antibiotic sensitivity testing methodologies is essential for quality control.

Purpose of the Study:

• To compare the performance of a paper disc method (AB Biodisk, Sweden) and a tablet method (Neo-Sensitabs, A/S Rosco, Denmark) for bacterial antibiotic sensitivity testing.
• To evaluate the concordance and identify potential discrepancies between the two methods.
• To assess the clinical relevance of any observed differences in sensitivity classification.

Main Methods:

• Utilized the paper disc method (AB Biodisk) and the tablet method (Neo-Sensitabs) for parallel antibiotic sensitivity testing.
• Tested a representative panel of bacterial strains against a range of antibiotics using both methods.
• Classified bacterial strains into sensitivity groups (e.g., sensitive, intermediate, resistant) based on established criteria for each method.

Main Results:

• A high degree of agreement was observed between the paper disc and tablet methods.
• Approximately three-fourths of the bacterial strains were classified into identical sensitivity groups by both methods.
• Discrepancies between the methods were infrequent and generally minor in nature, suggesting minimal impact on clinical interpretation.

Conclusions:

• The paper disc and tablet methods demonstrate comparable performance for routine antibiotic sensitivity testing.
• Both methods are reliable for classifying bacterial susceptibility to antibiotics, with high concordance.
• The findings support the interchangeable use of these two methods in many clinical microbiology settings.