This is a 32-week, open-label, exploratory study with a 4-week screening period, 16-week treatment phase designed to investigate dupilumab's effect on skin barrier function as measured by TEWL before and after STS in approximately 20 pediatric patients with moderate-to-severe AD (not more than 24 patients aged ≥6 and \<12 years old), and a 12-week follow-up period. Patients will have 1 on-site visit/week, up to Week 4, 1 on-site visit every 2 weeks from Week 4 to Week 8, and 1 on-site visit every 4 weeks from Week 8 to Week 16 End of Treatment (EoT) phase visit, and every 6-weeks thereafter during the follow-up period and by this will end the study for each participant (End of Study \[EoS\]). The maximum duration of the study per participant will be 32 weeks (including screening period). Skin barrier function in approximately 10 healthy volunteers (not more than 20 healthy participants aged ≥6 and \<12 years old) matched for age (match on age ±2 years), gender, location of targeted lesion area, and study site to the AD cases will be assessed in a similar manner at baseline, and will have 1 on-site visit/week, up to Week 4, 1 on-site visit every 2 weeks from Week 4 to Week 8, and 1 on-site visit every 4 weeks from Week 8 to Week 16 EoT phase visit, and every 6-weeks thereafter during the follow-up period, serving as a reference comparator for skin barrier function.
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Percent change from baseline in TEWL after 5 STS assessed on lesional skin at Week 16 in AD patients.
Timeframe: From baseline to week16