Example of SEIR model describing between host disease transmission.

<p>There are four individuals/nodes in the contact network and five edges. Different colors indicate different health states. Also each node is randomly assigned an incubation and infectious period sampled from a discrete distribution. For simplicity, each of the nodes in this example has an incubation period of 0 days and an infectious period of 2 days. On day 0, node <i>A</i> is infectious while all other nodes are susceptible. On day one, node <i>C</i> is infected due to contact with node <i>A</i> and on day two, node <i>A</i> recovers, while nodes <i>B</i>, <i>C</i> and <i>D</i> are infectious. There are no susceptible nodes after day two. On day three, node C recovers. Finally on day four, all nodes recover. Unlike this example, the networks used in this study have approximately 76000 and 20 million nodes.