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Results of the total sIgA concentrations (a,b) and the IBV-specific sIgA titers (c,d) in the tracheas and intestines, detected by ELISA. Concentrations and optical delnsity under 620 nm wavelength (OD620) are shown as mean values + S.D. of each group. Tukey’s multiple comparison test was used for statistical analysis; * p < 0.05, ** p < 0.01.
