Figure 1. Hierarchical model linking serosurveillance data with R₀ in the population of infected flocks, through the final size equation.

m, mean R₀ in the population of infected flocks; s², variance of R₀ in the population of infected flocks; R_0i, basic reproductive number of each infected flock i; p, final size of the epidemic; x, proportion of positive samples; n, total number of samples.