Hit second liver vaccine why to still do not have antibody

After the hepatitis B vaccine, there is still no antibody. It may be caused by insufficient injection times. The hepatitis B vaccine requires a total of three injections. The second injection should be injected the second month after the first injection, and the third injection should be injected six months later. It may also be caused by infection with invisible hepatitis B. Hepatitis B virus DNA should be admitted to hospital for examination.