Fig. 1.

A sample of 10 outbreaks starting with a bimodal distribution having ${\mathrm{ℛ}}_0=0.9$ in which $3/10$ of the population causes 3 infections and the rest cause none. The top row denotes the initial states, showing each of the 10 initial infections. An edge from one row to the next denotes an infection from the higher node to the lower node. Most outbreaks die out immediately.