Figure 2.

Shaded areas are combinations of $\overline{n}$ and R₀ required to generate a pandemic probability via reassortment in humans that falls within the 95% support interval presented in figure 1. Shades correspond to attack rates of human influenza (i.e. probability of an individual acquiring human influenza per year) and thus to different rates of co-infection, c. Results assume that r=0.01; if r=0.1 is assumed instead, the values on the horizontal axis simply need to be divided by 10.