Antibody responses in immunized mice with BV-Dual-HA. Mice were immunized i.m. with BV-Dual-HA, pc-HA, AcMNPV-WT or PBS. An identical booster immunization was carried out 3 weeks later. Serum samples were collected on day 20 (red bars) and day 42 (blue bars) to determine the HI antibody titers (A), VN antibody titers (B). All data represent the mean ± S.D.