Fig. 3From: Ducks induce rapid and robust antibody responses than chickens at early time after intravenous infection with H9N2 avian influenza virusVirus titer and HI antibody responses of chickens and ducks intravenously infected with the H9N2 virus. a - c Virus titers were determined in 13 different organs of birds at the indicated time points: 1 dpi (a), 2 dpi (b), and 3 dpi (c). d An HI assay was used to test the serum samples of the birds at the indicated time points. dpi: days post-infectionBack to article page