Hepatitis B virus surface antigen negative What does it mean?

Hepatitis B virus surface antigen is a two-in-a-half examination of hepatitis B in the project, if hepatitis B virus surface antigen is negative and hepatitis B virus DNA is positive, there is latent chronic hepatitis B, if hepatitis B virus DNA is negative, indicating that there is no hepatitis B virus infection, it is recommended to do hepatitis B vaccine injection.