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Changing MIC Breakpoints: Do Mechanisms Count

Changing MIC Breakpoints: Do Mechanisms Count

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<strong>MIC</strong> Reproducibility<br />

• In this imperfect reality an ESBL producer<br />

with a cefotaxime <strong>MIC</strong> of 1 g/mL (probably<br />

responsive to cefotaxime in vivo) cannot be<br />

reliably distinguished from one with an <strong>MIC</strong> of<br />

4 g/mL (probably not responsive) and it is<br />

simpler and safer to follow the precautionary<br />

approach of seeking the ESBL and, if found,<br />

reporting the isolate as resistant<br />

- David Livermore, 20 th European Congress of<br />

Clinical Microbiology and Infectious Diseases,<br />

Vienna, Austria, 10-13 April, 2010.<br />

25

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