The final epidemic size R(N), the proportion of nodes that become triggering nodes via clinical signs or screening and the proportion of nodes that have been contact traced during the epidemic are plotted in figure 6 as a function of tracing probability F for disassortatively (rZK0.2) and assortatively (rZ0.2) mixed networks. First, transmission rates are chosen such that R(N)z0.73 on both networks (tZ0.125 and 0.175 on disassortatively and assortatively mixed networks, respectively; figure 6a ) and, second, the transmission rates are the same (tZ0.0528) with R(N)z0.225 on both networks (figure 6b). For the first case, the effect of contact tracing is similar on both networks with comparable R(N); however, we identify two distinct regimes above and below FZ0.61, above which contact tracing becomes more effective on disassortatively mixed networks (figure 6a).