TABLE 1.

Demographic characteristics of populations and dose regimens

Vaccine	Group	Dosage (ml)	No. of subjects in the following population:				Mean ± SD (range) age of subjects, in yr
			Safety	Efficacy	Men	Women
Virosome (Inflexal Verna V)	A1	0.5, once	4	4	1	3	4.1 ± 1.6 (1.9–5.6)
	A2	0.5, once	15	14	6	9	14.5 ± 5.7 (6.4–26.1)
	B1	0.25, twice	5	5	1	4	3.8 ± 1.7 (1.6–6.0)
	B2	0.25, twice	19	17	8	11	16.4 ± 6.3 (8.4–33.1)
Subunit (Influvac)	C	0.25, twice	2	1	0	2	2.9 (2.9–2.9)
	D	0.5, once	19	18	7	12	15.7 ± 7.3 (6.1–31.9)