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Serum IgG antibody titers obtained by ELISA assays. Ducks were immunized with the pcDNA3.1(+)/gC DNA vaccine by IM injection or gene gun bombardment, and serum was collected at days 3, 5, 7, 14, 28, 42, and 70, as indicated. The results represent the average of triplicate wells and are expressed as means ± SD.
