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DPV-specific IgA and IgG in sera were detected by antigen-capture ELISA. Sera were collected at 1, 2, 3, 4, 5, 6, and 8 weeks, and the level of IgA (A) or IgG (B) in each sample was detected and compared with that for the negative-control group. *, P < 0.05 compared to control group; **, P < 0.01 compared to control group.
