Blood transmission; vertical transmission from mother to child; sexual transmission. Hepatitis B is not transmitted through the gastrointestinal and respiratory tracts, so daily contact such as shaking hands, hugging, working together, eating together, etc. generally does not transmit hepatitis B. Special reminder: dental fillings, face trimming, pedicures, medical devices such as needles, oral equipment, endoscopes, etc. are not thoroughly disinfected and are also easily overlooked as a means of transmission of hepatitis B. China’s hepatitis B virus infected nearly 100 million people, so in life can not avoid contact with hepatitis B virus carriers, so what are the specific ways of transmission of hepatitis B? 1, through the blood transmission: such as the input of infected whole blood, plasma, serum or other blood products, or other blood-borne injection transmission. 2, fetal source of transmission: such as pregnant women with viruses through the birth canal to the newborn vertical transmission; late pregnancy hepatitis infection of the fetus, etc., in previous years, most of the hepatitis B virus carriers are infected through this route, in recent years have taken the corresponding preventive measures, greatly reducing the chances of transmission of this link. 3, medical transmission: fillings, facial, pedicure, medical equipment such as needles, oral equipment, endoscopes, etc. are contaminated with hepatitis B virus after incomplete disinfection or improper handling, can cause transmission; with a syringe to several people preventive injection is also one of the ways of medical hepatitis B transmission; hemodialysis is also a way of hepatitis B transmission. 4, sexual contact transmission: sexual promiscuity, homosexuality and intimate sexual behavior between heterosexuals is an important way of transmission of hepatitis B virus, this transmission also includes the transmission of family couples, the transmission rate of defenseless sexual behavior between couples is about 14%, the specific attraction varies. Because hepatitis B virus can be detected in the saliva of hepatitis B patients, there is a possibility of transmission during kissing due to breakage of the skin and mucous membranes. Therefore, in the case of a broken mouth (such as ulcers, bites, bleeding gums, etc.) should avoid kissing with hepatitis B virus carriers. 5, insect bite transmission: mosquitoes and a variety of blood-sucking insects, may play a role in the transmission of hepatitis B. Such as direct or indirect skin mucous membrane breaks caused by mosquito bites are infected with hepatitis B virus (such as the pain and itch taken by the mosquito bite after scratching). According to domestic and foreign research for many years, the hepatitis B virus in the mosquito body simply can not replicate and reproduce, and hepatitis B virus with the blood is generally absorbed by mosquitoes within 14 hours will be digested. Even if not digested, hepatitis B virus in the mosquito body will not live more than 48 hours, and the mosquito blood-sucking interval in about 72 hours. There is also evidence that mosquitoes in the sucking blood and will not spit out the previous inhalation of blood to the body of the sucked. 6, close contact transmission: and hepatitis B patients or virus carriers in close contact for a long time, saliva, urine, blood, bile and breast milk, can contaminate utensils, items, by breaking the skin, mucous membrane transmission, become hidden hepatitis B virus transmission route. However, the amount of virus in the contaminated articles is generally very low, and the virus is often eliminated quickly because it does not reach the purpose of causing disease. From the above transmission routes, it can be seen that the chances of hepatitis B transmission occurring in general work contacts are very low. General contact in daily life such as sharing office supplies, exchanging money, public meals, etc. does not usually cause transmission. Knowing more about the transmission of hepatitis B can proactively avoid some risk factors and reduce the chances of infection. However, the easiest and most effective way to prevent the spread of hepatitis B is to get the hepatitis B vaccine and to have an antibody titer of 10 IU/ml in your body, so you can basically rest easy in your daily life.