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aOnly a susceptible breakpoint (≤4 μg/ml) has been established. Isolates with an MIC ≥8 μg/ml are reported as non-susceptible. Vertical lines indicate breakpoints for resistance. The white fields indicate the dilution range tested for each antimicrobial. Grey area indicates MIC values greater than or less than the tested concentration. Number of isolates is in percentage (%).*CI: Confidence intervals