highly significantp < 0.001
Wilcoxon rank-sum tests showed that there was a highly significant difference ( p < 0.001) between the baseline OD and each year of follow-up for both ELISA assays used (see S1 and S2 Figs, respectively for total and recombinant antigen ELISAs). 3.3.2 Serological evolution—percent change over time By analyzing the percent change of the OD readouts, additional information on the serological evolution of readouts was gained ( S1 Table ).