The minimum bactericidal concentration (MBC) is defined as the lowest concentration that kills at least what percent of the original inoculum?

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Multiple Choice

The minimum bactericidal concentration (MBC) is defined as the lowest concentration that kills at least what percent of the original inoculum?

Explanation:
The MBC is the lowest concentration of an antimicrobial that kills at least 99.9% of the original bacterial population. That 99.9% kill corresponds to about a 3-log reduction in viable cells (for example, from 10^6 to 10^3 CFU/mL). Among the options, 99.9% best fits this standard: it reflects a true bactericidal effect, whereas 95.5% or 97% are lower levels of kill, and 100% would imply total elimination—which isn’t the defined criterion for the MBC.

The MBC is the lowest concentration of an antimicrobial that kills at least 99.9% of the original bacterial population. That 99.9% kill corresponds to about a 3-log reduction in viable cells (for example, from 10^6 to 10^3 CFU/mL). Among the options, 99.9% best fits this standard: it reflects a true bactericidal effect, whereas 95.5% or 97% are lower levels of kill, and 100% would imply total elimination—which isn’t the defined criterion for the MBC.

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