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Age-dependent IgG seroprevalence. Seroprevalence is depicted as a function of age. Seroprevalence was determined using the mixture-model-derived cutoff for IgG responses. The age-dependent seroprevalence was modeled using a generalized additive model with a cubic spline for age and simultaneous CIs using a parametric bootstrap of the variance-covariance matrix of the fitted model parameters.
