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Under the simple SIR model, $R_0$ is approximated using the formula $R_0 = 1 + r \cdot T_s$, where $r$ is the growth rate and $T_s$ is the serial interval. This approximation assumes exponentially distributed generation times.

Conditions: Stated as an approximation under the simple SIR model.; The on-screen note says it assumes exponentially distributed generation times.

Under the simple SIR model, $R_0$ is approximated using the formula $R_0 = 1 + r \cdot T_s$, where $r$ is the growth rate and $T_s$ is the serial interval. This approximation assumes exponentially distributed generation times.

Conditions: Stated as an approximation under the simple SIR model.; The on-screen note says it assumes exponentially distributed generation times.

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.