IgG seroprevalence in all pigs 2013-2022
Time series of IgG seroprevalence in all pigs is shown in Figure 6. The trend in IgG seroprevalence was statistically significantly reduced over the study period (-2.1%/month, 95% CI -3.6—-0.5, P < 0.01), and annually, with peaks of IgG seroprevalence apparent from January – March (two small peaks) and May – September (two larger peaks). Consistent with IgM seroprevalence, most variation was due to the remainder (random) component in the time series (range -32.6—76.9).