Fig. (2) Biofilm production in microtitre plate assay by clinical isolates of S.aureus in TSB added of sub-inhibitory concentrations of rifampin, minocycline and rifampin+ minocycline. Dashed line indicates the cut-off OD (ODc) value. Average value of OD of control culture without drug: C10, C12, C40 and C50 < 0.300.