Figure 1. Decline of maternally-derived Neut-Ab to EV71 in 37 infants in the first year of life.

The scatter plot shows Neut-Ab titres in 37 individual infants from the time of birth to 12 months. These infants all had Neut-Ab titre to Ev71 ≥80 at birth. The infant having a detectable titre at 6 months had the highest Ab titre at birth (1280). Maternal Neut-Ab to EV71 were not detected in these infants at 9 and 12 months of age. The dashed line represents the limit of detection of the assay.