Is a positive hepatitis B surface antigen contagious?

Generally, whether hepatitis B surface antigen positive is contagious depends on the patient's specific infection status and viral replication level. If discomfort symptoms occur, it is recommended to seek timely diagnosis and treatment at a正规 hospital. Detailed analysis is as follows:

If a person who is hepatitis B surface antigen positive also has a high hepatitis B virus DNA quantitative test value and abnormal liver function, this usually indicates active viral replication and strong contagiousness. The virus can spread to others through blood, body fluids, and other routes, so special attention should be paid to protection and behaviors that may lead to virus transmission should be avoided.

If a person who is hepatitis B surface antigen positive has a very low or even undetectable hepatitis B virus DNA quantitative test value and long-term normal liver function, this often indicates suppressed viral replication and weaker contagiousness. However, it is not completely non-contagious, and care should still be taken to avoid sharing personal items that may come into contact with blood to reduce transmission risk.

Regular monitoring of hepatitis B virus DNA levels, liver function, and liver ultrasound is necessary to track the viral replication status. In daily life, attention should be paid to personal hygiene, and items such as toothbrushes, razors, syringes, and others that may contact blood should not be shared. If family members have not received the hepatitis B vaccine, timely vaccination is recommended to establish effective immune protection. Activities such as blood donation or organ donation that may lead to virus transmission should be avoided until a doctor evaluates and confirms there is no risk.