Pharmacokinetics, Safety and Efficacy of Nemolizumab in Participants With Moderate-to-Severe Atopic Dermatitis

Inclusion Criteria: * Chronic AD that has been documented for at least 6 months for participants aged 2-6 years and at least 1 year for participants aged 7-11 years before the screening visit and confirmed according to the American Academy of Dermatology Consensus Criteria at the time of the screening visit * EASI score \>=16 at both screening and baseline visits * IGA score \>=3 at both screening and baseline visits * AD involvement \>=10% of BSA at both screening and baseline visits * Peak (maximum) PP NRS score of at least 4.0 at both screening and baseline visits * Agree to apply a moisturizer throughout the study from the screening visit daily, and liberally as needed; agree to apply an authorized topical corticosteroids (TCS) from the screening visit and throughout the study as determined appropriate by the investigator * Participant and caregiver willing and able to comply with all of the time commitments and procedural requirements of the clinical trial protocol * Other protocol defined inclusion criteria could apply Exclusion Criteria: * Body weight less than 10 kilogram (kg) * Child in Care: a child who has been placed under the control or protection of an agency, organization, institution or entity by the courts, the government or a government body, acting in accordance with powers conferred on them by law or regulation * Participants with a current medical history of chronic bronchitis * Requiring rescue therapy for AD during the run-in period or expected to re…