Evaluation of Pharmacokinetics, Pharmacodynamics, Efficacy, Safety, and Immunogenicity of Ravulizumab Administered Intravenously in Pediatric Participants With Generalized Myasthenia Gravis (gMG)

Inclusion Criteria: Diagnosis of gMG confirmed by a positive serologic test for anti-AChR antibodies (Abs) obtained at Screening and/or during Screening Period Myasthenia Gravis Foundation of America (MGFA) Clinical Classification of Class II to Class IV at Screening Participants receiving treatment must be on a stable dosing regimen of adequate duration prior to Screening and during the Screening Period. Eculizumab-experienced participants must have been enrolled and treated with eculizumab in Study ECU-MG-303 for at least 6 months (180 days) and must have been on a stable dose for ≥ 2 months (60 days) prior to Screening. All participants must be vaccinated against meningococcal infection Exclusion Criteria: Medical Conditions Any untreated thymic malignancy, carcinoma, or thymoma. Participants with a history of treated benign thymoma History of thymectomy, thymomectomy, or any thymic surgery within the 12 months prior to Screening History of N meningitidis infection Known to be human immunodeficiency virus (HIV) positive History of unexplained infections Known or suspected history of drug or alcohol abuse or dependence within 1 year prior to the start of the Screening Period