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. 2023 Jun 5;16(6):839. doi: 10.3390/ph16060839

Table 5.

Fractional Inhibitory Concentration Index (FICI) of Ciprofloxacin (CIP) and EOs against Klebsiella pneumoniae strains. The FICI was the synergistic effect if its value was ≤0.5, additive if it was from >0.5 to ≤1, indifferent if it was from >1.0 to ≤4, and antagonism if it was >4.

Kp Strain 197U 817LCR 910LCR Mean FICI
CIP + thyme 0.333 0.333 0.500 0.389
CIP + turmeric 0.750 1.250 0.500 0.835
CIP + rosemary 0.490 0.370 0.516 0.459
CIP + peppermint 0.180 0.250 0.50 0.311