Journal of Antimicrobial Chemotherapy, Vol 40, 77-83, Copyright © 1997 by The British Society for Antimicrobial Chemotherapy
MT Suller, JM Stark and D Lloyd
Flow cytometry using the anionic membrane potential-sensitive fluorescent
probe, bis-(1,3-dibutylbarbituric acid) trimethine oxonol (DiBAC4(3)),
enabled assessment of antibiotic-induced membrane perturbation in five
clinical isolates of methicillin-resistant Staphylococcus aureus (MRSA) and
two antibiotic-sensitive reference strains, NCTC 6571 and 8325-4, after
establishment of steady-state growth in liquid cultures inoculated from
single colonies. Flow cytometric indications of the enhanced DiBAC4(3)
uptake after treatment with vancomycin at 0.1, 1, 4 and 10 x MIC showed
excellent comparison with viability losses quantified as cfu on solid agar
in MRSA isolate QC. The antibiotic susceptibility patterns to
benzylpenicillin, methicillin and vancomycin for all isolates used in this
study could be determined in 2-4 h from an overnight plate culture. This
technique thus provides a rapid and reproducible antibiotic sensitivity
test which may be applicable in routine clinical practice.
ORIGINAL ARTICLES
A flow cytometric study of antibiotic-induced damage and evaluation as a rapid antibiotic susceptibility test for methicillin-resistant Staphylococcus aureus
School of Pure and Applied Biology, University of Wales College of Cardiff, UK.
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