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RSV-F-specific IgG levels in the sera of mice intramuscularly immunized with various adjuvanted vaccines and RSV-F alone at weeks 0 and 2. The sera of six mice in each group were separately detected at 1 (A), 2 (B), 4 (C), 4, 8 and 18 (D) weeks by ELISA. Results are shown as mean ± SD of antibody titers calculated from all six mice in each group. “ns” P ≥ 0.05, ***P < 0.001 between two different groups.
