Fig. 2.

Fitting of the competition data to the mathematics model. Copy number (log₁₀) of virus as a function of time for the exponential growth phase of the two competition experiments. For each experiment/virus combination, there were four sets of data, results from duplicates of the single infection and those from duplicates of the dual infection. The lines are the estimated models. A fitness difference between EIAV variants PND-1 and PND-5 would manifest as a difference in slopes for the two viruses.