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Comparison of the effects of enterotoxin doses on antigen-specific serum antibody responses after i.g. administration. Shown are means ± SE of anti-A/Beijing8-9/93 HA antibody titers in the sera of mice immunized with 20-μg doses of A/Beijing8-9/93 HA antigen either alone (HA only) or in combination with wtLT, LT-K63, and LT-R72 as indicated. Asterisks indicate groups whose values are significantly greater than that of the HA only group (P ≤ 0.05).
