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Survival rate (A), weight loss (B) were measured for 14 days (n = 7). At day 4 post-challenge, lungs were collected and lung virus titer (C) were measured by plaque assay of MDCK cells (n = 4). Error bars represent standard errors. *, p<0.05; **, p<0.005; ***, p<0.001. n.s, not significant.
