Hepatitis B is an infectious disease caused by the hepatitis B virus. The hepatitis B virus enters the body and replicates in large numbers in the body. It is transmitted in three ways: the first way, blood transmission, through blood transfusion, surgery, trauma, dental repair, tooth filling, tooth extraction, scaling, tattoo, eyeliner, eyebrow tattoo and unclean injection. The second way of transmission, sexual transmission, is that the semen of men and vaginal fluids of women who have hepatitis B contain the hepatitis B virus. The third route of transmission is mother-to-child transmission, in which a pregnant woman infected with hepatitis B virus can transmit the virus to her newborn through childbirth. If the hepatitis B vaccine produces protective antibodies and surface antibodies, the baby will be resistant to the hepatitis B virus and less likely to get hepatitis B.