Immunity shots are useful for both normal people and patients with diseases. For healthy people, immunity shots can enhance the body’s immunity, generate a passive immune response, enhance the body’s ability to fight disease, and prevent the development of disease. For example, for patients with viral hepatitis B, immunity shots can enhance the body’s ability to fight viruses and eliminate the hepatitis B virus. For patients with primary or secondary T-cell deficiency diseases, immunity shots can effectively prevent the development of some diseases. For autoimmune diseases, such as rheumatoid arthritis and systemic lupus erythematosus, immunity shots can play an effective role in treatment.