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Antigen-specific IgA antibodies in feces. Fecal samples were collected from each group on days 0, 7, 14, 21, 28, 35, and 42 after the primary immunization, and the levels of anti-α specific IgA (a), anti-β2 specific IgA (b), anti-ϵ specific IgA (c), and anti-β1 specific IgA (c) were determined by ELISA (*p < 0.05, **p < 0.01). The results are presented as mean ± SD of each group.
