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sIgA concentrations in tear and oral swabs at 0, 7, 14, 21 and 28 dpv. (A) sIgA concentrations in tear swabs. (B) sIgA concentrations in oral swabs. Letters (a,b) indicate significant differences among vaccinated groups (p < 0.05). ** indicates p < 0.01 between vaccinated and nonvaccinated groups. (n = 10 chickens/group.)
