Table 1. Subjects’ baseline characteristics.

Baseline characteristic	Young	Older
Age range (median)	20–30 (24.5)	61 to >89 (78)
Gender
Male	16 (53%)	21 (66%)
Female	14 (47%)	40 (34%)
Ethnicity
White	21 (70%)	59 (97%)
Asian	9 (30%)	2 (3%)
Body mass index (range)	19–44 (23.1)	18–47 (25.1)
Cytomegalovirus (+)	57%	59%
Epstein Barr virus (+)	53%	67%
Previous immunizations	1–20 (4)	2–30 (13)
Ever diagnosed with Flu	2 (7%)	4 (7%)