Table 8.

Minimal Effective Concentration for HAI activity.

H3N2 strain	Pre vaccination		Post vaccination
	Geo Mean (ng/ml)	(±SD)	Geo Mean	(±SD)
Total Ig Serum	264.9a	2.38	30.76b,c	3.27
IgG Serum	223.9a	2.32	22.34b,c	3.25
IgA serum	40b	2.70	7.79d	3.44
Purified IgG	49.16a	2.84	44.56a,c	4.94
Purified IgA	99.48a	1.82	102.4a,c	1.53
HA-specific purified IgG	0.160d	3.33	0.52d	0.13
HA-specific purified IgA	0.12d	4.88	5.47d	4.90

N = 10, 5 young (18–35 y.o.), and 5 elderly (>65 y.o.) subjects.

^a−dPaired two-way ANOVA grouping.