Correction: Antigenic evolution of viruses in host populations

In the Time to the most recent common ancestor subsection of the Results, there is an error in the equation. The notation N in parentheses is incorrect. It should read N_inf. Please view the complete, correct equation here:

$$T_{MRCA2}=z\sqrt{\frac{2\text{log}\left(N_{inf}\right)}{v}}$$ (15)