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Antigen-specific B-cell memory responses of immunoglobulin A (IgA), IgG, and IgM isotypes in cholera patients and vaccinees, determined from enzyme-linked immunosorbent assay (ELISA) measurements of culture supernatant of memory B cells(MBCs). Asterisks indicate a statistically significant difference (P ≤ 0.05) from baseline (Day 0 or Day 2) levels within a particular antigen group.
