The source of hepatitis B infection is the patient infected with the hepatitis B virus, which can be divided into carriers of the hepatitis B virus and patients with chronic hepatitis B. Patients with recurrent episodes of liver inflammation leading to cirrhosis or even liver cancer are also contagious. As a source of infection, hepatitis B patients are more or less likely to be infectious. If a patient is not taking antiviral medication and is a major triple-positive patient, the quantification of hepatitis B virus DNA in the blood is relatively high and the possibility of transmission through the blood is higher. If you are a minor triple-positive patient, the DNA quantification of the hepatitis B virus is relatively low, which makes transmission less likely. If you take nucleoside analogues orally for antiviral treatment, the DNA quantification of hepatitis B virus in the blood is very low and the contagiousness of this condition is generally small. If you want to prevent transmission to other people, it is sufficient for those in close contact with you to be vaccinated against hepatitis B. In this way it is not possible to infect people who are immune to hepatitis B, regardless of whether the person with hepatitis B is a major or minor triplet, and whether they are taking antiviral medication.