Rapid Phenotypic Antimicrobial Susceptibility Testing

Rapid identification of bacterial antibiotic susceptibility is critical for selecting effective treatments and combating antimicrobial resistance. However, conventional antimicrobial susceptibility testing (AST) methods rely on culture-based techniques that can take days to produce results, delaying appropriate therapy and increasing the risk of resistant infections. This challenge is especially significant for slow-growing multidrug-resistant bacteria. There is a need for faster, accurate methods to determine antimicrobial susceptibility and minimum inhibitory concentrations (MICs).

 

Researchers at Arizona State University have developed a rapid phenotypic AST system which integrates multichannel Large-Volume Scattering imaging (LVSim), capable of simultaneously monitoring multiple bacterial samples, with a Bayesian Gaussian process model that analyzes bacterial growth dynamics. Validated using standard clinical strains, this system enables the precise and rapid determination of minimum inhibitory concentrations (MICs) within two hours, dramatically reducing the time compared to traditional 16-20 hour AST methods. This system supports timely and effective treatment against multidrug-resistant bacterial infections such as those seen in sepsis.

 

This technology represents a rapid and accurate antimicrobial susceptibility testing method combining multichannel large-volume scattering imaging with Bayesian modeling to combat multidrug-resistant infections.

 

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