FIG 7.

Analysis of the intestinal IgA heavy-chain mRNA expression after H5N9 infection in NT and ABX-treated ducks. IgA heavy-chain constant region mRNA expression levels were analyzed by RT-qPCR from total RNA extracted from the ileum of noninfected (NI) or H5N9-infected ducks that were either not treated (NT) or treated with ABX. IgA expression levels were normalized to RPL4 mRNA levels. Each dot represents an individual value, the horizontal bar corresponds to the mean, and error bars correspond to the SEM. *, P < 0.05; **, P < 0.01.