1, check whether there are infectious diseases, such as hepatitis B patients and tuberculosis.
2, check whether there are major organ diseases. Such as heart bypass and liver transplantation.
3, check whether there are sexually transmitted diseases or AIDS. Hepatitis B virus (HBV) is the pathogen that causes hepatitis B, belonging to hepatotropic DNA virus family, including hepatotropic DNA virus and avian hepatotropic DNA virus. It is hepatotropic DNA virus that causes human infection.