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Flowchart of study participants. The upper boxes in gray indicate the number of patients and controls enrolled and the reasons for exclusion. Children with RSV infection included in the study (blue boxes) were classified according to disease severity in RSV outpatients and RSV inpatients (ward and PICU). Yellow box indicates the number of healthy controls enrolled. Abbreviations: NP, nasopharyngeal; PICU, pediatric intensive care unit; RSV, respiratory syncytial virus.
