Viral hepatitis B, referred to as hepatitis B or Hepatitis B, is an infectious disease caused by hepatitis B virus with liver damage as the main cause. Hepatitis B is mainly transmitted through the following ways: 1, mother-to-child transmission: Hepatitis B virus is transmitted through the placenta (intrauterine transmission), or from the birth canal when a pregnant woman is giving birth (perinatal transmission). Sexual contact: unprotected sexual intercourse, homosexual sexual contact. 3, close contact transmission: blood, semen, vaginal secretion, breast milk of hepatitis B patients or carriers may contain hepatitis B virus, which is contagious and can contaminate utensils and articles. Young children may be infected through scratching and biting; they may also be infected with hepatitis B by using contaminated objects in daily life, such as razor, nail clippers, and intravenous drug injection (sharing needles with other people). 4. Blood-borne transmission: receiving blood or blood products contaminated with hepatitis B virus. In developed countries or regions, blood donors are screened for hepatitis virus, so the possibility of hepatitis infection through blood in these regions is extremely low. 5.Medical transmission: If medical devices are contaminated by hepatitis B virus and not sterilized or improperly handled, it can cause transmission, such as dentists and other medical surgeries, cosmetic surgeries (tattoos, piercings) and so on. The infection rate through sharing needles with hepatitis B patients is 30%.