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Estimation of serum antibody response and cross-reactivity analyses of the antibodies from the immunized mice versus recombinant purified proteins rHN (A) and rF (B) by ELISA at various days post-first injection. The comparison between samples was conducted using the Duncan test at the 5% level, and the error bars are ± 1 SD. Values within a column followed by different letters are significantly different (p < 0.05).
