Hepatitis B virus is less likely to be transmitted when it leaves fresh blood. Hepatitis B virus is mainly transmitted through blood. The virus can be transmitted from the blood of an infected person to others through wounds, or through blood transfusion, hemodialysis, etc. However, if the blood leaves the body, its infectiousness decreases rapidly. However, if the blood leaves the body, its infectiousness decreases rapidly. Therefore, when the virus leaves fresh blood, the chance of transmission is also relatively low, and most of the virus has already lost its activity. Hepatitis B virus handles transmission through blood, but also through mother-to-child transmission, close contact transmission, and medical transmission. Close contact transmission refers to the transmission through the patient’s vaginal secretions, semen, breast milk, etc., of which sexual contact transmission is also a common mode of transmission. Medical transmission is mainly through contaminated syringes, blood collection equipment and so on. It is recommended to protect yourself on a daily basis, and if the risk of exposure is high, get the Hepatitis B vaccine from the hospital in time to protect yourself.