The epidemic threshold of the susceptible - infected - recovered model is a boundary separating parameters
how such slow dynamics can prevent estimation of the distance to the threshold from fluctuations in the susceptible population .
The epidemic threshold of the susceptible - infected - recovered model is a boundary separating parameters that permit epidemics from those that do not .
Here , we show analytically how such slow dynamics can prevent estimation of the distance to the threshold from fluctuations in the susceptible population .