TABLE 1.

Murine VN antibody responses against potato plant-derived IBV S1 glycoprotein

Group	Immunizationa	No. of mice	VN titerb
1	Transgenic plant I (1 g)	6	1:621
2	Transgenic plant II (0.5 g)	6	1:300
3	IBV live vaccine	6	1:57
4	Nontransgenic potato	6	0
5	Buffer	6	0

^aMice were immunized three times by grastric intubation on days 0, 7, and 14.

^bThe VN titer is the geometric mean titer obtained 7 days after the third vaccination.