RecruitingPhase 2Drug trialReslizumab in the Treatment of Eosinophilic Granulomatosis With Polyangiitis (EGPA) StudyReslizumab is a type of medicine called a monoclonal antibody that is made in the research clinic; it works by blocking a specific protein in the body called interleukin-5. The study medicine, reslizumab, is not yet approved for doctors to treat patients with EGPA. It is considered an experimental drug in this study.