A Study to Evaluate the Efficacy and Safety of JYP0061 in Patients With Acute Neuromyelitis Spectrum Disease (NMOSD)

Inclusion Criteria: * Neuromyelitis spectrum disease (NMOSD) patients according to 2015 International consensus diagnostic criteria. * Positive Aquaporin 4 immunoglobulin G (AQP4-IgG) * Patients with acute NMOSD * Female serum pregnancy test results were negative at the time of screening, subject (including partner) had no child-rearing plan and voluntarily adopted double contraceptive (non-oral contraceptives) within 6 months from screening to the last study drug administration, and had no sperm/egg donation plan; * Have fully understood this study, voluntarily participate in the experiment, and voluntarily sign the written informed consent. Exclusion Criteria: * Pregnant or lactating women; * Suspected or clear allergy to similar ingredients or any ingredient in the study drug, or allergic constitution; * Symptoms improved in the acute phase before the study drug was used; * Unable to complete MRI or gadolinium enhanced examination;