Long-term Follow-up Study of Serum Immunoglobulin G and Immunoglobulin A Antibodies After <i>Helicobacter pylori</i>Eradication

Abstract

A serology test is useful for evaluating eradication in children. Approximately half of patients with successful eradication remained to be IgG-seropositive and IgA-seropositive at 12 months' posttreatment. When a decrease titer in antibody is used for assessing eradication, an endpoint of >/=6 months is required. The IgA antibody may be a more convenient indicator of H pylori status than is the IgG antibody.