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Contribution of PB1-F2 to pathogenicity of recombinant KS07 in BALB/c mice. (a) Average body weights of surviving mice in each group up to 14 days p.i. are represented as percentages of the original weight on day 0. Letters a and/or b on the value point of each day address significant differences (P<0.05) between infected groups (a, KS07_WT and KS07_N66S; b, KS07_K/O and KS07_N66S). The error bars indicate sem. (b) Survival rates of mice infected with indicated viruses.
