What are the ways of transmission of hepatitis B virus? Vertical transmission from mother to child is the main mode of transmission, i.e. the virus is transmitted from the H B s A g positive mother to the next generation during pregnancy and delivery. Other modes of infection include close contact in kindergartens or families, which may be related to the fact that the immune function is not yet complete and perfect during infancy and childhood, and the virus cannot be cleared after infection with the hepatitis B virus, which is latent in the liver and begins to develop after a long period of immune tolerance. Medical and sexual contact are also important ways of H B V transmission. The vast majority of existing hepatitis B cases in China are chronic hepatitis B. Patients are almost always infected with the hepatitis B virus at an early age (maternal intrauterine, during delivery, while breastfeeding, preschool infection, etc.); acquired infection, especially in adults, generally rarely forms chronicity, either causing an acute hepatitis B attack, where the hepatitis B virus is completely cleared and soon cures itself; or after infection with the hepatitis B virus, the body More than 90 % of acute hepatitis B can be completely cured. There are no serious sequelae, the hepatitis B surface antigen (HB-sAg) is cleared from the blood, and the patient can develop anti-D HB-s antibodies to prevent reinfection. However, about 10% of HBSA g may persist for more than six months. These patients may have developed chronic hepatitis B. Some chronic hepatitis B can develop into cirrhosis or liver cancer, which can be very dangerous. Some viewers may ask if daily work or life contact can transmit hepatitis B. Studies have shown that HBV is not generally transmitted through blood-sucking insects (mosquitoes, bedbugs, etc.). Although daily contact does not transmit HBV, we still need to pay attention to active prevention. Personal prevention of hepatitis B should be noted from the following five aspects: First is the hepatitis B vaccination, which is the most critical measure to prevent hepatitis B. Research studies show that the HBsAg positivity rate of the vaccinated and unvaccinated population in China is 4.51% and 9.51% respectively. From here we can also see that effective vaccination is of great significance to prevent hepatitis B virus infection; secondly, actively prevent medical transmission, the use of medical equipment, syringes, invasive medical treatment and surgery without strict sterilization, as well as intravenous drug abuse, such as foot trimming, tattoos, earring holes, etc., which do not have sterile isolation conditions, accidental exposure of medical personnel at work, sharing razors and toothbrushes, etc. can spread hepatitis B virus; third pay attention to personal hygiene, develop good hygiene habits; fourth know the emergency preventive measures for hepatitis B, such as marriage when the other party does not have hepatitis B protective antibodies, should first be injected with hepatitis B vaccine, in the production of hepatitis B surface antibodies before getting married; after being accidentally injured by a blood-bearing needle should be promptly injected with anti-hepatitis B immunoglobulin; fifth to know the disinfection measures for hepatitis B virus, HBV to the external environment Chlorine preparations, ethylene oxide, glutaraldehyde, peroxyacetic acid and iodophor also have a good inactivation effect, and attention to hand washing with soap in life can also achieve a certain effect of decontamination and prevention of infectious diseases. If you do the above, there will be no big problem with hepatitis B prevention.