Figure 6. Virus-mediated induction of intracellular defense factors can lead to peaks in R₀ for two different viral strategies, s: a “stealth strategy” and a “saturation strategy”.

Plotted is the basic reproductive ratio, R₀, as a function of strategy, s, for two different values of the infectivity parameter, r₂. The rest of the parameters are as follows: , d = 0.1, a = 4, n₁ = 16. The infectivity parameter r depends on the strategy. It is given by r = r₂-s(r₂-r₂/10)/10 if s<10, and r = r₂/10 if . These functions are shown in the inset for the two values of r₂.