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2016 ; 4
(ä): 95-103
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Bacterial Cytological Profiling (BCP) as a Rapid and Accurate Antimicrobial
Susceptibility Testing Method for Staphylococcus aureus
#MMPMID26981574
Quach DT
; Sakoulas G
; Nizet V
; Pogliano J
; Pogliano K
EBioMedicine
2016[Feb]; 4
(ä): 95-103
PMID26981574
show ga
Successful treatment of bacterial infections requires the timely administration
of appropriate antimicrobial therapy. The failure to initiate the correct therapy
in a timely fashion results in poor clinical outcomes, longer hospital stays, and
higher medical costs. Current approaches to antibiotic susceptibility testing of
cultured pathogens have key limitations ranging from long run times to dependence
on prior knowledge of genetic mechanisms of resistance. We have developed a rapid
antimicrobial susceptibility assay for Staphylococcus aureus based on bacterial
cytological profiling (BCP), which uses quantitative fluorescence microscopy to
measure antibiotic induced changes in cellular architecture. BCP discriminated
between methicillin-susceptible (MSSA) and -resistant (MRSA) clinical isolates of
S. aureus (n = 71) within 1-2 h with 100% accuracy. Similarly, BCP correctly
distinguished daptomycin susceptible (DS) from daptomycin non-susceptible (DNS)
S. aureus strains (n = 20) within 30 min. Among MRSA isolates, BCP further
identified two classes of strains that differ in their susceptibility to specific
combinations of beta-lactam antibiotics. BCP provides a rapid and flexible
alternative to gene-based susceptibility testing methods for S. aureus, and
should be readily adaptable to different antibiotics and bacterial species as new
mechanisms of resistance or multidrug-resistant pathogens evolve and appear in
mainstream clinical practice.