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The herd immunity threshold (HIT) is computed using the formula $\mathrm{HIT} = 1 - \frac{1}{R_0}$. This represents the immune fraction of the population needed so that each case infects fewer than one other on average, stopping sustained spread.

Conditions: The narration adds assumptions of random mixing and a fully effective vaccine.; The goal stated is that each case infects fewer than one other on average.

The herd immunity threshold (HIT) is computed using the formula $\mathrm{HIT} = 1 - \frac{1}{R_0}$. This represents the immune fraction of the population needed so that each case infects fewer than one other on average, stopping sustained spread.

Conditions: The narration adds assumptions of random mixing and a fully effective vaccine.; The goal stated is that each case infects fewer than one other on average.