Fig. 4: Time to most recent common ancestor (TMRCA), evolution rate and spatial diffusion rate of virus clusters infecting multiple farms.

Comparisons of Cluster A, C and D in TMRCA (month, year) (a), evolution rate (substitution/site/year) (b) and spatial diffusion rate (km/year) (c). Data are presented as means (square, circle and diamond) and 95% highest posterior density (HPD) intervals (error bars), estimated with Bayesian phylogenetic methods with MCMC algorithm (with a chain length of 1 × 108 steps sampling every 1 × 104 steps). Cluster A, C and D are in red, green and blue, respectively.