Figure 2: A diagram of the contagion process over time. At the beginning of the contagious spread, S% of nodes are randomly selected as initially affected, and the network contagion process spreads until B% overall baseline prevalence (across all clusters) is reached (time t$_{B}$ ). In this figure, S = 1 and B = 20 . Individuals are affected according to Algorithm 2 in the paper. Then, each cluster is randomly assigned to be exposed ( A = 1 ) or unexposed ( A = 0 ). The probability of transmission from an affected node in an exposed cluster is 1 / 3 that on a node in an unexposed cluster. The process continues for another T = 5 time steps. 0 10 20 30 40 0 ... t$_{B}$ t$_{B}$ 5 Before Exposure Unexposed Exposed A = 0 p$_{0}$= p$_{exposed}$ A = 1 p$_{1}$ = p$_{0}$ 1 3 Contagion Process Over Time Propor tion Affected 21