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Chequerboard assays and isobolograms for evaluation of synergism between bovine lactoferrin (BLF) and levofloxacin (LVX) combinations against H. pylori strains. The calculation of the best BLF and LVX combination and the FIC index is displayed. FIC index values were interpreted as follows: synergy (FIC index ≤0.5); antagonism (>4.0); and no interaction (>0.5–4.0). Shading shows visible bacterial growth.
