If your girlfriend has hepatitis B, there is a certain chance that she will transmit it to her boyfriend, but this chance is not great. The main ways of transmission of hepatitis B are blood transmission, sexual transmission and vertical transmission from mother to child, and vertical transmission from mother to child is the main way of transmission of hepatitis B in China. We often see in the clinic that one of the spouses has hepatitis B and has been living together for decades, but the other one is not infected, which means that hepatitis B is not very contagious. In addition, it is recommended that family members or close contacts with hepatitis B patients, or carriers of the hepatitis B virus, must be vaccinated against hepatitis B. If surface antibodies are produced after vaccination against hepatitis B, there is protection at this time, and the chances of being infected with hepatitis B again are very low.