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Comparison of the effects of i.m. and i.n. administrations of A/Beijing93 HA on antigen-specific serum antibody responses. Shown are mean anti-A/Beijing93 HA serum Ig antibody titers of groups of 10 mice immunized as shown in Table 1. Asterisks indicate groups whose values are significantly greater than those of the corresponding i.m. immunized group (P ≤ 0.05).
