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(A) IgG1 titers on Day 4 after hRSV A long challenge. (B) IgG2a titers on Day 4 after hRSV A Long challenge. (C) IgG1/IgG2a ratio on Day 4 after hRSV A long challenge. Statistically significant differences were measured by one-way ANOVA with Newman–Keuls posttest. *** p<0.001, **p<0.01, * p<0.05.
