Age specific sero-prevalence plot of
antibodies using maximum-likelihood fits from reversible catalytic equilibrium model . The vertical axis shows the proportion of sero-positive individuals in each age group, the horizontal axis shows the midpoint age. Red triangles represent observed prevalence and blue fitted line is predicted age prevalence curve. λ = 0.0134 (95% CI, 0.010 - 0.018) and ρ = 0.0799 (95% CI, 0.0532 - 0.1200).