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Scatter plot of the automated microscopy resistance score versus ertapenem disk diffusion reference. Vertical dashed lines indicate 2013 CLSI breakpoints for susceptible and resistant, and the horizontal dashed line indicates the microscopy score interpretation criterion value of 1.4. Strains KP-456 and KP-505 were KPC negative by PCR but resistant by disk diffusion for ertapenem and meropenem.
