Table 1.

Cohort description.

Cohort	Age group	N =	Age (median; range)	% of females	% of participants with completed vaccination course (3 dosesa)	Month of blood drawing after the third vaccine doses (median; range)
Early cohort	Adolescents	117	11 y; 10–14 y	100	100	2; 0.3–8
	Adults	57	26 y; 18–53 y	100	100	3; 1–7
Late cohort	Adolescents	70	12 y; 11–14 y	100	100	53; 17–59
	Adults	71	21 y; 18–26 y	100	100	52; 12–60

^aThe vaccine has been administered by intramuscular route. Boosting doses were given at 2 and 6 months after the priming dose.