Immune response in infants aged @-@ weeks was lower than that in older participants and , @ months after third vaccination , antibody concentrations were significantly higher than pre-vaccination concentrations in Filipino ( @ U/mL -LSB- @-@ -RSB- vs @ U/mL -LSB- @-@ @ -RSB- ) , but not Pakistani ( @ U/mL -LSB- @-@ @ -RSB- vs @ U/mL -LSB- @-@ @ -RSB- ) , infants .