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ELISA analysis of the anti-Vp7 IgM titers in the sera of grass carp. Serum samples were collected on the indicated days post oral vaccination. The results represent the means and standard deviations from three independent experiments. The comparison between the DR1947 group with the Naive group or the DR1956/2020 group was shown. Values that were significantly different from the control were indicated by asterisks (* p < 0.05, ** p < 0.01).
