Fig 6. Benign strain is dominant in all three conditions of co-infection delay ($\mathcal{D}$).

Introduction of the benign strain (B) 30 steps before the introduction of the malignant strain ($\mathcal{D}=+30$), or simultaneously ($\mathcal{D}=0$) greatly hampers the spread of B strain but introducing this strain 30 steps after the introduction of M strain ($\mathcal{D}=-30$) tighten the competition between the strains. Each trajectory is the average of 100 runs. The shaded areas contain the trajectories of all the 100 runs for the given parameters. For virus M, all the parameters of probability distributions to generate the waiting times were set as one. For virus B, the waiting times had been generated from Exp(λ = 3)and Weibull(λ = 1, ω = 0.5). The immune system was not active in all the runs.