Adults need to be vaccinated against hepatitis B. In addition to the routinely recognized mother-to-child transmission, hepatitis B vaccine can also be transmitted through sexual intercourse, blood transfusion, and unclean injections. Adults may have the opportunity to be infected with the hepatitis B virus through their behavioral habits, such as transmission between husband and wife, or going to a small clinic to have teeth extracted without the extraction tools being properly sterilized, or going to a barber store and using someone else’s used razor, etc. All of these ways may lead to hepatitis B infection. Generally, three vaccinations are required, one month after the first vaccination and the sixth month after the vaccination, and can be given to adults at the CDC. After vaccination, the titer of hepatitis B surface antibody can be rechecked, and if the titer value increases significantly, the vaccination is effective.