Hepatitis B carriers are generally contagious, even if there is no disease is also contagious, and “90% of hepatitis B carriers do not develop disease” this statement is not appropriate, carriers about 1/4 to 1/5 of the population each year may develop disease, such as transaminase elevation. Hepatitis B carriers generally refers to the presence of hepatitis B virus infection in the body, but clinically normal liver function indicators, there is no obvious liver inflammation, liver fibrosis, cirrhosis of the liver. These patients are still infectious because of the presence of hepatitis B virus in their bodies. As long as hepatitis B virus is detected in the body, hepatitis B patients may be transmitted to other people or fetuses through blood contact, sexual contact and vertical transmission from mother to child. Hepatitis B carriers are generally contagious, but there is a difference between high and low contagiousness, if the number of hepatitis B virus carriers is relatively low, the contagiousness of this type of low, if the number of hepatitis B virus is relatively high, then the contagiousness is correspondingly high. You can’t judge the level of infectiousness based on whether or not you have a disease. Hepatitis B five test results, if the E antigen is positive, it also indicates that the patient is more contagious. Therefore, contact with hepatitis B virus carriers still need to pay attention to protect themselves, avoid blood and sexual contact, the most effective means of prevention should be injected with hepatitis B vaccine.