Figure 5
Stacked area graphs representing the age-dependent seroprevalence profile over a five year period in a single vaccinated dairy herd. The herd was serologically sampled in (A) 2010, (B) 2011, (C) 2013 and (D) 2015. In this herd, vaccination started in 2012. The left y-axis (the number of animals) refers to the smoothed histograms (seropositive, seronegative) and the right y-axis (seroprevalence) to the coloured line. The lines represent age-dependent seroprevalence profiles, which were coloured according to the epidemiological stages as outlined in Figure 2.