It is normal for infants to have a low fever after receiving the hepatitis B vaccine, as long as they are careful not to touch the wound with water. If a large rash appears, it indicates an allergic reaction to the vaccine and prompt medical attention should be sought at the hospital. Hepatitis B is a chronic infectious disease that seriously threatens the health of our people and can cause hepatitis, liver fibrosis, liver cirrhosis and even liver cancer. For hepatitis B carriers, it is recommended to have regular liver disease checkups every six months to follow up on any hepatitis attacks. For those who are positive for hepatitis B surface antibody in the hepatitis B half, it means that they have been vaccinated against hepatitis B and have good immunity to hepatitis B. They do not need to worry about being infected by the hepatitis B virus. The higher the concentration of hepatitis B surface antibody, the stronger the resistance to the hepatitis B virus.