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The basic reproduction number, denoted $R_0$, is defined as the average number of new infections caused by a single case in a population where everyone is susceptible. It serves as an early-outbreak measure of transmission potential.

Conditions: Applies to a population where everyone is susceptible.; Used here as an early-outbreak measure.

The basic reproduction number, denoted $R_0$, is defined as the average number of new infections caused by a single case in a population where everyone is susceptible. It serves as an early-outbreak measure of transmission potential.

Conditions: Applies to a population where everyone is susceptible.; Used here as an early-outbreak measure.