Fig. 1 The spatial solutions for the different contact rates
of exposed and infectious populations (left curve: c = 1,
v = 0.15; middle curve: c = 0.8, v = 0.17; right curve:
c = 0.6, v = 0.18) for t = 700 days. Fixed parameters:
τ = 10 days, s = 15 days. For this and the next 5 figures:
+ shows the wake solution; o shows the front solution; solid
line shows the approximate solution.