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. 2022 Jun 23;13:869650. doi: 10.3389/fmicb.2022.869650

TABLE 5.

The best synergistic concentrations of Rifampin-Melittin based on MBC against selected isolates.

MRSE 1, and 4*
ATCC 35984
MSSE 1
MRSE 8
Rif+Mel (μg/ml) FBC indices Rif+Mel (μg/ml) FBC indices Rif+Mel (μg/ml) FBC indices Rif+Mel (μg/ml) FBC indices
122+0.625 0.61 0.0312+2.5 0.99 0.25+0.312 0.74 0.5+0.625 0.75
124+0.312 0.37 0.0312+1.25 0.74 0.25+0.156 0.62 0.5+0.312 0.62
126+0.156 0.24 0.0312+0.625 0.62 0.25+0.078 0.55 0.5+0.156 0.56
128+0.009 0.13 0.0312+0.312 0.56 0.25+0.039 0.53 0.5+0.078 0.52
128+0.004 0.12 0.0312+0.156 0.53 0.25+0.019 0.51 0.5+0.039 0.51
0.0156+2.5 0.74 0.25+0.009 0.5 0.5+0.019 0.5
0.25+0.004 0.5 0.5+0.009 0.5
0.125+0.625 0.75 0.5+0.004 0.5
0.125+0.312 0.49 0.25+1.25 0.75
0.125+0.156 0.37 0.25+0.625 0.5
0.125+0.078 0.3 0.25+0.312 0.37
0.125+0.039 0.28 0.25+0.156 0.31
0.0625+0.625 0.625 0.25+0.078 0.27
0.0625+0.312 0.37 0.25+0.039 0.26
0.0625+0.156 0.24 0.25+0.019 0.25
0.0312+0.625 0.56 0.25+0.009 0.25
0.0312+0.312 0.31 0.25+0.004 0.25
0.0312+0.156 0.18 0.125+1.25 0.62
0.125+0.625 0.37
0.125+0.312 0.24
0.125+0.156 0.18
0.125+0.078 0.15
0.125+0.039 0.14
0.125+0.019 0.13
0.0625+1.25 0.56
0.0625+0.625 0.31
0.0625+0.312 0.18
0.0625+0.156 0.12
0.0625+0.078 0.09
0.0625+0.039 0.07
0.0312+1.25 0.53
0.0312+0.625 0.28
0.0312+0.312 0.15

FBC, fractional bactericidal concentration; MRSE, methicillin-resistant S. epidermidis; ATCC, American type culture collection; MSSE, methicillin-susceptible S. epidermidis. *These isolates had the same MBC results, that way, the same synergism formulation was used, and surprisingly, the same results were found again. The best synergistic bactericidal concentrations and their FBC indices for various isolates were bolded.