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Colistin-meropenem combination using the Etest (90°). Etest strip of colistin with either imipenem or meropenem was placed at 90°crossing at the MIC of the each drug as determined with previous test results. The black arrows indicate the antibiotic concentrations in combination. In this Figure, the MIC of meropenem was determined to be 1.5 μg/ml, and that of colistin in combination was 0.38 μg/ml. CS, colistin; MRP, meropenem.
