Glycoprotein-specific antibody titres were significantly increased in participants in the low-dose and high-dose vaccine groups at both day @ ( geometric mean titre @ -LSB- @ % CI @-@ -RSB- and @ -LSB- @-@ -RSB- , respectively ; p < @ ) and day @ ( @ -LSB- @-@ -RSB- and @ -LSB- @-@ -RSB- , respectively ; p < @ ) .