TABLE 2.

Percentages of children with antibody concentrations of ≥0.15 μg/ml and >1.0 μg/ml by age at boosting for each blood sample

Age at booster% of children with indicated antibody concn (μg/ml)a
Before boosterAt indicated time after booster
One moSix moOne yrTwo yr
≥0.15>1.0≥0.15>1.0≥0.15>1.0≥0.15>1.0≥0.15>1.0
6-11 mo94 (75/80)75 (60/80)99 (80/81)99 (80/81)100 (78/78)95 (74/78)100 (71/71)77 (55/71)99 (66/67)54 (36/67)
12-17 mo77 (20/26)38 (10/26)100 (29/29)100 (29/29)96 (22/23)96 (22/23)95 (20/21)95 (20/21)100 (14/14)86 (12/14)
2-4 yr64 (162/253)19 (48/253)100 (235/235)99 (233/235)100 (199/199)99 (197/199)99 (157/158)97 (153/158)100 (158/158)91 (143/158)
  • a Values in parentheses are no. of children with the indicated antibody concentration/total no. of children.