Hepatitis B is the common name for hepatitis B. Foreigners refer to the disease as hepatitis B. The reason for such a name is that it is numbered according to the order in which viral hepatitis is found. More colloquially, hepatitis B is the second in the family of viral hepatitis! Many viruses can cause hepatitis, but not all viruses that can cause liver damage are hepatitis viruses. Viruses like influenza virus and measles virus, which can multiply in many tissues and organs in the body and cause lesions in many organs, including the liver, are not hepatitis viruses. Only those viruses that reproduce basically only in liver cells and cause liver inflammation are classified as hepatitis viruses. So far, only five hepatitis viruses have been discovered, and in the order of discovery, they are named hepatitis A, B, C, D, and E. The main components of the hepatitis B virus are protein and DNA. protein forms the viral shell and skeletal structure, and is also responsible for causing the body’s immune response. HBV DNA is the genetic material of the hepatitis B virus, and there is only one set of DNA for each virus in the core of the virus; therefore, a blood test for HBV DNA will determine the amount of virus in the blood.