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Adaptive evolution of the virus at varying levels of coinfection when both gene segments undergo selection. The mean (log) population fitness are shown for (A) the whole virus, (B) the antigenic gene segment, and (C) the non-antigenic gene segment for three different coinfection rates (β = 0, 0.0125, and 0.025 per day). Five hundred simulations were run at each of the three coinfection levels. Solid lines show the means of the simulations’ mean (log) population fitness levels.
