The Minimum Inhibitory Concentration (MIC) is:

Question

BlackTom AI · Accepted Answer

The question asks for the definition of the Minimum Inhibitory Concentration (MIC).
Option 1: 'The concentration of antibiotic that kills all bacteria' describes the minimum bactericidal concentration (MBC) or a killing effect, not the inhibitory concentration. MIC is about inhibition of growth, not necessarily killing, so this is incorrect.
Option 2: 'The lowest concentration of antibiotic that inhibits bacterial growth' precisely matches the standard definition of MIC. It is the smallest amount of an antimicrobial agent needed to prevent visible growth of a microorganism after a specified incubation period, which is the core concept behind MIC.
Option 3: 'The highest concentration of antibiotic that inhibits bacterial growth' contradicts the meaning of MIC, which concerns the minimal effective amount, not the maximum. Therefore this is incorrect.
Option 4: 'The concentration of antibiotic that shows intermediate susceptibility' describes a category used in susceptibility testing (e.g., intermediate/susceptible/resistant breakpoints), but it does not define MIC itself. This is not an accurate definition of MIC.
Thus, among the given choices, the statement that accurately defines MIC is the one describing the lowest concentration that inhibits growth, as MIC focuses on inhibition at the minimal effective dose.

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