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Comparison of the effects of HA doses on antigen-specific SW IgA responses after i.g. administration. Shown are means ± SE of anti-A/Beijing8-9/93 HA SW IgA antibody titers of groups of mice immunized either with 20 μg of HA administered alone (HA only) or with 1-, 5-, or 20-μg doses of A/Beijing8-9/93 HA in combination with either 10 or 100 μg of LT-R72 as indicated. Asterisks indicate groups whose values are significantly greater than that of the HA only group (P ≤ 0.05).
