Figure 4 A, B & C: Kinetics of antibody response to BVDV after vaccination. A: All animals; B: animals with initial antibody titers >35% by PD-ELISA; C: animals with initial antibody titers <35% PD Targeted vaccine group; Conventional vaccine group. Dotted-dashed Lines at 12% and 35% indicate the PD% values that correlate with the threshold establish for qualifying vaccines: low-quality vaccines, <12% PD, satisfactory vaccines <35% PD.