Figure 2.

Watts–Strogatz small world network. Agents are placed in a ring-like topology and linked to their k nearest neighbors (black lines). Next, every link is rewired randomly with a small probability p (cyan lines). Every agent has one of four states: susceptible (gray), exposed (gold), infectious (red), or removed (black). Infectious agents spread the disease to connected susceptible agents with a probability $p_I$ in each time step. The size of network nodes is proportional to the node degree. (a) Strongly clustered network. Almost all contacts are restricted to neighbors ($p=0.1$). (b) Weakly clustered network with a large fraction of random contacts ($p=0.5$). Other parameters are equal in (a) and (b): $n=15$ agents, $k=4$ average contacts.