Fig. 2.

Bayesian skyline plot of population dynamics estimated for Italian IBV QX strains. Mean, median and upper and lower 95HPD values of relative genetic diversity (i.e. Ne · τ) are plotted over time. The number of monthly clinical outbreaks associated to each genotype (color-coded) is reported as circles (randomly jittered to avoid graphical overlapping), whose radius is proportional to the number of events. The different phases (i.e. vaccination strategies) have been represented as solid (double vaccination) or dotted (Mass only vaccination) lines and numbered accordingly to the order reported in the manuscript. The time window considered ranges from the MRCA (mean value) to the most recent sample. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)