In figure 4 , in the absence of tracing, the final epidemic size R(N) is plotted against the transmission probability for r2{K0.2, K0.1, K0.05, 0, 0.05, 0.1, 0.2}. In this case, compartments T and R are equivalent and the current SITR model is equivalent to the well-known SIR model with an effective infectious period of 1/a. The relationship between R(N) and T p is qualitatively similar to the relationship between GC size and link density in figure 2. The epidemic threshold for assortatively mixed networks occurs at a lower transmission probability than for the other two mixing patterns. However, the final epidemic size approaches its asymptote, total network size, faster for disassortatively mixed networks. The two network types with rZK0.2 and 0.2 produce approximately equal epidemic sizes at tz0.0528 (transmission probability T p z0.15), when R(N)z0.225 on both types.