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RSV/A/long-neutralizing antibody levels in the sera of mice intramuscularly immunized with various adjuvanted vaccines and RSV-F alone at weeks 0 and 2. The sera of five mice in each group was separately tested at 2 (A), 4 (B), and 18 (C) weeks by plaque assay. Results are shown as mean ± SD of neutralizing antibody titers calculated from all five mice in each group. “ns” P ≥ 0.05, *P < 0.05, **P < 0.01 between two different groups.
