Hepatitis B patients with 2, 4, or 5 positives are not contagious. 2, 4, or 5 positives refer to positive hepatitis B surface antibody, hepatitis B e antibody, and hepatitis B core antibody, which can only occur in patients who have recovered from the hepatitis B virus and are not called hepatitis B patients, but rather healthy adults. In this case, there is no hepatitis B virus DNA molecule in the body, so it does not cause infection. However, it depends on whether there are special circumstances to determine, because in the case of 2, 4, 5 positive, the body’s immune system is suppressed in people who have undergone long-term immunosuppressive treatment, such as radiotherapy, and it is possible that several or tens of trace amounts of hepatitis B virus DNA molecules remain in the body, which can multiply again under immunosuppressive conditions, and the hepatitis B virus DNA can be detected. The hepatitis B virus DNA can be detected. Therefore, when a person with this condition undergoes immunosuppressive treatment or long-term radiotherapy, it is important to check the five hepatitis B tests, liver function and changes in hepatitis B virus DNA.