Testing physiologically relevant conditions in minimal inhibitory concentration assays

Area of Science:

• Microbiology
• Pharmacology
• Infectious Diseases

Background:

• Minimal inhibitory concentration (MIC) assays are standard for antimicrobial susceptibility testing.
• Traditional MIC assays use laboratory media, which may not reflect in vivo conditions.
• There is a need for MIC assays that better mimic clinical infection environments.

Purpose of the Study:

• To adapt the MIC broth microdilution assay for use with physiologically relevant media.
• To provide a protocol for preparing media mimicking clinical conditions like lung exudate, wound exudate, or blood.
• To enable more accurate antimicrobial susceptibility testing for clinical pathogens.

Main Methods:

• The study extends a previous protocol for MIC assays.
• A platform for preparing custom media is described.
• The MIC broth microdilution assay is applied using these tailored media.

Main Results:

• The developed method allows for antimicrobial susceptibility testing in media that mimic in vivo conditions.
• The protocol is applicable to ESKAPE pathogens and other aerobic pathogens.
• The assay can be completed within 3-4 days.

Conclusions:

• This enhanced MIC assay provides a more clinically relevant method for determining antimicrobial susceptibility.
• The protocol facilitates testing against pathogens in conditions closer to those found in patients.
• This approach can aid in the development and application of novel antimicrobial drugs.