Hepatitis B virus is the abbreviation of hepatitis B virus, which is transmitted in three main ways: the first is blood transmission; the second is sexual transmission; and the third is mother-to-child transmission. The first kind of blood transmission is mainly through blood transfusion, surgery, trauma, dental repair and filling, tooth extraction, tattoo, eyeliner, eyebrow tattoo, ear piercing, etc. The second sexual transmission, the chance of infection is very low, because after marriage, often the other party is an adult with normal immune function, then more than 90% of adults infected with hepatitis B virus can clear the virus naturally. The third type of transmission through mother to child, the chances of the baby being infected in the uterus are very small, often during the delivery process.