FIG 1.

Protection against challenge strains in pigs vaccinated with whole inactivated virus (WIV) or live-attenuated influenza virus (LAIV) in study 1. (A to C) Lung and trachea lesions were evaluated at 5 dpc. (D to F) Viral titers were measured in bronchoalveolar lavage fluid (BALF) at 5 dpc (D) and in nasal swab samples at 3 and 5 dpc (E, F); the number of pigs with a positive virus titer/total number of pigs is indicated above each bar. Bars are labeled with the vaccine and challenge strain used for each group of pigs. Data are presented as mean values ± standard errors of the means. Different lowercase letters within each graph indicate statistically significant differences (P ≤ 0.05). NV, not vaccinated; NC, not challenged.