Phase Ia/Ib Trial of SCTA02A Injection in Healthy Adults and Patients With Chronic Hepatitis B

Inclusion Criteria: * Healthy volunteers: 18 to 60 years old (inclusive) * Participants with chronic hepatitis B: 18 to 65 years old (inclusive) * Sex: male or female * Male body weight ≥ 50 kg, female body weight ≥ 45 kg, and body mass index (BMI): 18 kg/m² ≤ BMI ≤ 28 kg/m² Exclusion Criteria: * Hypersensitivity or intolerance to immunoglobulin, the active ingredient or excipients of SCTA02A; Any history of severe allergic reactions * History of active infection or fever within 14 days prior to enrollment * Presence of primary disease of major organs * Diagnosis of autoimmune disease * Use of any prescription drugs, over-the-counter drugs, or herbal medicines within 7 days prior to dosing * Participation in another clinical trial of investigational drug or medical device within 3 months prior to screening * Vaccination within 30 days prior to screening * History of prior malignancy * Major surgical procedure within 3 months prior to screening * Weekly alcohol consumption exceeding 14 standard units within 3 months prior to screening * History of drug or substance abuse