Dynamics of Single-City Influenza with Seasonal Forcing: From Regularity to Chaos
Figure 4
Dynamics with loss of individual immunity. Individuals now lose immunity (; Figure 1). Parameters and initial conditions have the values in Table 1. (a) Short-term dynamics: susceptible and delayed numbers are calculated with (2) and (1), the dynamic reproductive ratio with (22), and hospital admission rate with (5). (b) Longer-term dynamics.