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Microdilution MICs of ceftazidime and meropenem without amebas (broth microdilution MIC [bm MIC]) and with amebas (intracellular MIC [iMIC]) in the test wells. Results for both drugs were significantly different by a paired t test (for ceftazidime: P < 0.0001, pairing P = 0.0002; for meropenem: P < 0.0001, pairing P = 0.0004).
