FIG. 1.

The change over 52 weeks in serum levels of anti-H. pylori IgG in gerbils after H. pylori inoculation. IgG levels were determined by ELISA. ●, serum antibody level of gerbils during first 12 weeks after inoculation. Mean antibody values (n = 5, 10, 10, 7, and 10) were 0.9, 0.9, 2.4, 21.5, and 31.9 AI, respectively. ▴, serum antibody level of ulcer group. Mean value and SD of the group were 605.1 and 159.4 AI (n = 2, 1, and 2) at 26, 38, and 52 weeks postinoculation, respectively. ○, serum antibody level of hyperplastic group. Mean value and SD of the group were 177.4 and 120.8 AI (n = 3, 3, and 13) at 26, 38, and 52 weeks postinoculation, respectively. For other details, see Results.