Table 1. Increase in anti-HBs antibody titer in 9 of 17 volunteers who ate three doses of HBsAg-transgenic potatoes.

		Fold increase
Volunteer no.	Day 0, mlU/ml	Day 7	Day 14	Day 21	Day 28	Day 35	Day 42	Day 56	Day 70
1	17	1.2	4.1	8.2	15.8	25.2	23.6	27.2	29.2
2	9	1.0	5.9	8.2	8.2	9.4	7.2	6.8	6.7
3	20	2.1	2.9	4.2	22.6	23.8	44.9	32.6	37.3
4	85	0.9	5.8	14.3	36.0	42.0	48.9	53.3	56.3
5	120	1.2	2.4	3.3	5.0	5.6	13.2	14.3	14.3
6	72	1.1	1.9	3.8	4.9	7.3	15.3	17.0	17.0
7	85	0.9	1.0	0.9	1.3	2.5	2.1	1.9	1.3
8	40	0.9	1.0	1.8	3.0	3.1	8.3	10.8	8.6
9	50	0.9	1.1	1.5	4.5	7.3	9.3	13.3	14.9
10	115	1.9	4.4	9.2	17.1	26.7	25.8	30.0	28.4

Volunteers 1–5 and 10 had at least a 2-fold increase in their individual antibody titers after one dose of trangenic potato eaten on day 0.