Table 2. Geometric Mean Titer (GMT) Through 72 Weeks^ˆ by Serogroup.

Serogroup	Geometric Mean Titer* (95% Confidence Limits)
	Week 0 (n=49)	Week 4 (n=49)	Week 24 (n=49)	Week 28 (n=49**)	Week 72 (n=44)
A	12 (6,22)	3871 (2158, 6944)	689 (342, 1388)	3175 (1909, 5281)	488 (221, 1078)
C	8 (5, 12)	52 (24, 112)	28 (14, 54)	484 (250, 937)	65 (30, 140)
W-135	7 (5, 11)	783 (551, 1112)	573 (403, 816)	2167 (1558, 3014)	528 (358, 779)
Y	87 (45, 168)	1039 (614, 1757)	636 (418, 967)	1438 (1023, 2021)	488 (302, 789)

^*Due to assay limitations, exact titers could not be provided for results <8 or >131,072. For purposes of calculating medians and geometric mean titers, results <8 were set equal to 4 and those >131,072 were set equal to 262,144.

^**N=48 for serogroup Y

^ˆLimited to participants with serology results available from at least Weeks 0, 4 and 2