Table 2.

Stability of antibody responses to Helicobacter pylori antigens over 21 years in 95 subjects* who were IgG seropositive in 1973

	No of subjects positive in that assay		Antibody level
Assay	1973	1994	1973	1994
H pylori IgG†	95	87	3179	3009
H pylori IgA†	59	54	180	201
CagA IgG‡	69	69	0.75 (0.24)	0.80 (0.21)

*In 95 subjects (mean age 35.0 (12.0) years) who were IgG seropositive in 1973.

†Shown as reciprocal geometric mean titres (RGMT).

‡Shown as mean optical density ratio units (SD).