The Impact of Coinfections and Their Simultaneous Transmission on Antigenic Diversity and Epidemic Cycling of Infectious Diseases

Figure 3

As in Figure 2 except immunity period = 3 years. Under this short immunity period, no cyclical epidemics appear within the ranges of parameters investigated.

(a) 𝜙=0.5,  𝛽₃=0.0,  𝛽₄=0.0

(b) 𝜙=2,  𝛽₃=0.0,  𝛽₄=0.0

(c) 𝜙=0.5,  𝛽₂=0.75,  𝛽₄=0.0

(d) 𝜙=2,  𝛽₂=0.75,  𝛽₄=0.0

(e) 𝜙=0.5,  𝛽₂=0.75,  𝛽₃=0.6

(f) 𝜙=2,  𝛽₂=0.75,  𝛽₃=0.6