Fig. 3

a Exponential model to study and calculate the antibody decline kinetics in not previously infected subjects. Blue dot line indicates the graphic representation of the exponential model, the single blue dots the median values at different time-points and black vertical lines the interquartile range of distributions. b Power function model to study and calculate the antibody decline kinetics in not previously infected subjects. Blue dot line indicates the graphic representation of the power function model, the single blue dots the median values at different time-points and black vertical lines the interquartile range of distributions