Figure 1

Paired influenza A Multiscreen ELISA s/n values against the nucleoprotein of influenza virus two weeks after vaccination (prior to exposure) and at necropsy (bars represent the mean of s/n values (± SD) to influenza ■ after vaccination, □ at necropsy. Positive s/n < 0.673; negative s/n > 0.673. ^{a,b and z,y} Statistically significant differences between paired samples for the NV and HE groups before exposure and at necropsy (p < 0.05).