Hepatitis B virus can be inactivated in boiling water if it is sterilized by boiling for about 3-5 minutes. The survival time of hepatitis B virus outside the body is mainly influenced by the ambient temperature. If it is at room temperature and the temperature is between 20-40°C, generally the hepatitis B virus can survive in vitro for about 7-10 days. As the temperature rises, the hepatitis B virus can generally be inactivated after about seven hours if it is in the middle of a water temperature of about 80°C. For autoclaving in hospitals, the hepatitis B virus can also be inactivated after about 3-5 minutes. In addition, for patients with chronic viral hepatitis B in the family, their own toothbrushes, razors and utensils should be properly isolated. It is important to avoid blood transmission of hepatitis B virus to other members of the family, so that other normal people can be infected with chronic viral hepatitis B. The other members of the family should be tested negative for hepatitis B surface antigen and be vaccinated against hepatitis B in a timely manner to achieve self-immune protection, so that they are generally less likely to be infected with chronic viral hepatitis B.