Fig. 5.

Critical mutation rate as a function of mutagen absorption and viral replication rate, as determined by exact numerical solution. Parameters are k = 2, R₀ = 20, m = 10, α₂ = 1, and ρ₂ = 1. (A) α₁ varies and ρ₁ = 1. (B) ρ₁ varies and α₁ = 0.1.