Human immunoglobulin is used to improve the immune function of the body and is indicated for the following conditions: 1. Patients with primary immunoglobulin deficiency or hypoimmunity, such as common variant immunodeficiency diseases. 2. Patients with secondary immunoglobulin deficiency diseases, such as severe infections or neonatal sepsis. 3. 4. viral infections, such as measles virus, hepatitis virus, varicella-zoster virus, rubella virus, etc. 5. bacterial infections, such as chronic lymphocytic leukemia, can also be treated with human immunoglobulin to prevent bacterial infections. 6. allergic diseases, such as allergic asthma, allergic rhinitis and eczema, can also be treated with human immunoglobulin.