alexa Rapid flow cytometric assessment of mecillinam and ampicillin bacterial susceptibility.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Molecular Biomarkers & Diagnosis

Author(s): Walberg M, Gaustad P, Steen HB

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Abstract The effects of antibiotics on Escherichia coli during exponential growth in liquid medium were monitored by flow cytometry measuring cellular DNA content and cell size of individual cells in large numbers as well as cell counts. A statistically significant increase in cellular DNA as well as size was recorded after 20 and 40 min of incubation with the MIC of ampicillin and mecillinam, respectively. The optical density (OD600nm) of treated cultures continued to increase for at least 80 minutes, showing that the increase in cellular DNA and size reflected continued growth and elongation of cells coupled with inhibition of cell division, the latter being confirmed by the cell counting. Since fixation, staining and flow-cytometric analysis can be carried out within a few minutes, the present results suggest that flow cytometry may have potential as a rapid and quantitative technique that can be automated for clinical and experimental susceptibility testing of antibacterial drugs.
This article was published in J Antimicrob Chemother and referenced in Journal of Molecular Biomarkers & Diagnosis

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