Fig. 1: Baseline RSV antibody titers stratified by age group and RSV A/B illness status.

Plots show participant-level antibody titers represented by the dots, which are overlaid by box plots and violin plots to illustrate the distribution and density of the antibody data. Box-plot elements are defined as follows: center line, median; box limits, upper and lower quartiles; whiskers, 1.5× interquartile range. Baseline antibody titers are stratified by age group only for (A) binding antibody titers (log₁₀-AU/mL) (n = 2996) and (B) neutralizing antibody titers (log₁₀-IU/mL) (n = 1373). These plots are further stratified by RSV A/B illness status for (C) binding antibody titers (log₁₀-AU/mL) (n = 2996) and (D) neutralizing antibody titers (log₁₀-IU/mL) (n = 1373). Abbreviations: log₁₀-AU/mL log₁₀-transformed arbitrary units per milliliter, log₁₀-IU/mL log₁₀-transformed international units per milliliter, RSV respiratory syncytial virus, SD standard deviation.