The survival time of Hepatitis B virus in air is usually more than 24 hours. In water (60℃ water), Hepatitis B virus will survive for about 10 hours; in 100℃ water, Hepatitis B virus will survive for about 10 minutes. Therefore, boiling for sterilization for more than 10 minutes can kill the hepatitis B virus. However, the transmission of chronic viral hepatitis B is mainly through blood transmission as well as vertical transmission. For airborne hepatitis B virus, there is no significance of infectiousness, so there is no significance for airborne hepatitis B virus testing. In addition, patients should actively check the hepatitis B tri-system to see if they are positive for hepatitis B surface antigen. If the patient does not have a positive hepatitis B surface antigen, the diagnosis of chronic viral hepatitis B is most often not made, and at this point it is necessary to look at whether the patient’s hepatitis B surface antibody is negative or positive and the level of titer. If the patient has been injected with hepatitis B vaccine and the titer of hepatitis B antibody is high, the patient has self-protection mechanism, and usually will not be infected with chronic viral hepatitis B.