Proportion of participants with a seroresponse. The graphs show the subpopulation of participants with available data, for example, those who had a baseline sample and a day 151 and/or day 361 sample. Infants were defined as having a seroresponse if the RSV post-F antibody fold-change from baseline was above the respective cut point (>0.07 at day 151 or >0.02 at day 361; Supplementary Information Section 1 ). The box is bounded by the 25th and 75th percentiles; the line within the box represents the median. The whiskers represent 1.5interquartile range. MA, medically attended; n , number of infants who had a baseline sample and a day 151 and/or day 361 sample.
