For small host communities, the depletion of susceptible hosts can play a significant role in limiting an ongoing outbreak. What is the effect of a finite population size on these analytical results which assume an infinite host population? Figure 3A compares the simulated outbreak size distribution of different sized populations with our analytical predictions. Note that, for populations greater than 500, there is close agreement between numerical and analytical results. When considering populations of size 1,000 or more, we do not expect population size dependence to have a substantial effect.