Hepatitis B surface antigen titer between 5 and 10 is weakly positive, which generally indicates that the human body may be infected with hepatitis B virus. If the hepatitis B surface antigen titer suggests a weak positive, clinically it is also necessary to carry out hepatitis B two half, hepatitis B virus DNA quantitative, liver function, abdominal ultrasound and other tests to further diagnose whether the patient is contagious and whether the liver function is impaired, and if the patient has antiviral treatment indications, it is also necessary to carry out antiviral treatment in a timely manner. Hepatitis B virus infection is more common in clinic, because hepatitis B virus may lead to hepatitis, cirrhosis, and even liver cancer and other diseases, so hepatitis B carriers need to regularly review hepatitis B two half, hepatitis B virus DNA quantitative, hepatitis B surface antigen negative people can be injected with the hepatitis B vaccine to improve the protective effect.