Validation of protection status and duration by sampling time between month one (M1) and month 5 (M5).

We compare the number of unprotected (U) and protected (P) individuals between data and model prediction, and determine the proportion of protected whose duration of protection () is also predicted accurately. In this summary, individuals are excluded if the measured IgG antibody level for model calibration falls above the limit of quantification for the given month, and if the time window to extract the duration of protection from the data exceeds 45 days.