Children with negative hepatitis B surface antibodies in their blood are at risk for hepatitis B virus infection. Hepatitis B antibodies include hepatitis B surface antibodies, hepatitis B e antibodies and hepatitis B core antibodies. Hepatitis B surface antibody is a protective antibody produced by the body after infection with hepatitis B virus or injection of hepatitis B vaccine, which has the ability to fight against hepatitis B virus. Hepatitis B e antibody is a marker of Hepatitis B infection, and its positivity indicates that the Hepatitis B virus is not actively replicating and has low infectiousness. Hepatitis B core antibody is the antibody corresponding to the core antigen of hepatitis B virus, non-protective antibody, and its positivity indicates that it has been infected with hepatitis B virus in the past, and the blood memory is left after the body removes it. Warm reminder: whether there is hepatitis B virus infection need to improve the hepatitis B five, hepatitis B DNA test, visit a professional hospital, comprehensive analysis, under the guidance of the doctor to deal with.