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Figure 2 | Virology Journal

Figure 2

From: Comparative pathology of pigs infected with Korean H1N1, H1N2, or H3N2 swine influenza A viruses

Figure 2

Mean gross and histological lung lesion scores for the four experimental pig groups at each different PID. (A) The H3N2-infected pigs had severe pneumonic lesions at PID 2, while H1N1- and H1N2-infected pigs lacked gross lesions; however, at PID 14, the lesion score of H1N1-infected pigs were significantly higher (P < 0.05) than those of H1N2- and H3N2-infected pigs. (B) The H3N2-infected pigs had higher histological lesion scores than H1N1- and H1N2-infected pigs at PID 2; reversely, at PID 14, the score of H1N1-infected pigs were significantly higher (P < 0.05) than those of H1N1 and H3N2 pigs.

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