Effects of Internal Border Control on Spread of Pandemic Influenza
Figure 4. For an epidemic beginning in Darwin, the value of the median time delay, m20, in the presence of travel restrictions applied at a delay of 0–6 weeks (8 weeks in [A] and [B], respectively). Assumptions are (A) reproduction number (R0) = 1.5, constant infectivity profile; (B) R0 = 1.5, peaked infectivity profile; (C) R0 = 2.5, constant infectivity profile; (D) R0 = 2.5, peaked infectivity profile; (E) R0 = 3.5, constant infectivity profile; (F) R0 = 3.5, peaked infectivity profile. The gray panes cover the periods when the epidemic grows from 20 to 1,000 infected people in Darwin. Dotted, dashed, dash-dotted, and solid lines correspond to 99%, 90%, 80%, and no travel restrictions, respectively.