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Onset of illness symptoms in household members in 30 families in which a parent or a sibling was considered as the primary case of respiratory syncytial virus (RSV) in the family. Each line represents 1 family, and Day 0 is the day of illness onset in the RSV-positive index child. Squares indicate fathers, circles indicate mothers, and triangles indicate siblings. Filled objects indicate RSV-positive family members and open objects are RSV-negative family members.
