The MIC-to-MBC ratio is the standard for expressing the bactericidal potency of an antibiotic.
MIC is minimal inhibitory concentration, which is the lowest concentration of an antibiotic that inhibits growth of > 99% of the bacteria present.
MBC is the minimal bactericidal concentration, which is the lowest concentration of an antibiotic that kills > 99.9% of the bacteria present in a broth culture medium.
MIC-to-MBC ratio =
= (MIC) / (MBC)
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