FIG 3.

Antibody responses induced in pigs by whole inactivated virus (WIV) and live-attenuated influenza virus (LAIV) vaccines in study 1. (A) Serum hemagglutination inhibition (HI) geometric mean titers against OH/04 and IN/13 at 0 and 5 dpc. *, HI titers differed by more than two serial dilutions between 0 and 5 dpc. (B, C) Whole-virus IgA (B) and IgG (C) assays were performed using BALF from 5 dpc with OH/04 and IN/13 as antigens. Bars are labeled with the vaccine and challenge strain used in each group of pigs. Data are presented as mean optical densities (O.D.) or geometric mean titers ± standard errors of the means. Different lowercase letters within the same graph indicate statistically significant differences (P ≤ 0.05). NV, not vaccinated; NC, not challenged.