Figure 4From: Comparative pathology of pigs infected with Korean H1N1, H1N2, or H3N2 swine influenza A virusesIHC staining scores at each different PID. Mean antigen-positive score of the viral antigens of H3N2-infected pigs (P < 0.05) was higher than those of the other group’s pigs at PID 2. However, the viral antigen numbers of the H1N1-infected pigs significantly higher (P < 0.05) than those of H1N2- and H3N2-infected pigs at PID 14.Back to article page