Hepatitis B virus DNA can be detected in the sperm of a man with hepatitis B. As the sperm enters the egg cell, even though the mother does not have hepatitis, the hepatitis B virus proliferates during the formation of the embryo of this fertilized egg, making this offspring a hepatitis B patient or a carrier of the virus, and thus this mode of transmission of the hepatitis B virus is known as paternally-acquired transmission. However, the chance of this mode of transmission is very small and almost negligible. However, father-to-child transmission can be accomplished in other ways. Close contact in daily life, sex during pregnancy, etc. may cause pregnant women to be infected by the hepatitis B virus, which in turn may infect their offspring through father-mother-infant transmission, which is in fact a kind of indirect father-to-child transmission. This type of father-mother-infant transmission can be completely avoided. In daily life, fathers can also transmit Hepatitis B through usual contact. Although the chances of this are again small, the family aggregation of Hepatitis B suggests that it is possible to transmit Hepatitis B through close contact in life. Currently, however, babies are mandatorily vaccinated against hepatitis B at birth, and the chances of transmission by life contact are now greatly reduced. What is the infection rate of father-to-child transmission of hepatitis B? Studies have shown that hepatitis B virus does lurk in the sperm of hepatitis B patients, and at the time of conception, when the sperm and the egg unite, the sperm with the hepatitis B virus is very likely to pass on the viral genes to the offspring, resulting in a long term or even lifelong carriage of the hepatitis B virus. However, the chance of such vertical transmission from father to child is very small, so small that it is negligible. If such vertical transmission does occur, there is no way to avoid hepatitis B infection in the baby. Even if the baby is injected with hepatitis B immunoglobulin at birth to block it, it is useless. Most of the father-to-child transmission of hepatitis B occurs later in life through close contact. Although the way of transmission of hepatitis B through life contact is very small, it is still capable of transmission due to the fact that the hepatitis B vaccine was not widely available in the past, coupled with the poor healthcare conditions, less knowledge about hepatitis B, and the imperfect immune system of children. At present, newborns must be mandatorily injected with hepatitis B vaccine, and the chances of father-to-child transmission of hepatitis B have been greatly reduced. Because the popularization of hepatitis B vaccine has not been long, there are no detailed statistics at present, but according to clinical experience, the chances of father-to-child transmission of hepatitis B have been so small that they can be ignored. Chance of father-to-child transmission of hepatitis B There is a rumor on the Internet that the chance of father-to-child transmission of hepatitis B is as high as 85.7%, which is an extremely irresponsible statement. At present, there is no definite conclusion on the chance of vertical transmission from father to baby at home and abroad, but it is worth affirming that the chance of vertical transmission from father to baby is very small, almost negligible. At present, most of the father-to-child transmission of hepatitis B is acquired through intimate contact, or because the father and mother had intimate contact during the mother’s pregnancy, resulting in father-mother-infant transmission, but this is not a vertical transmission from father to child. It is entirely possible to avoid or interrupt transmission through means. If the father is a Hepatitis B carrier or Hepatitis B patient, intimate contact should be avoided during the mother’s pregnancy, or the mother should be vaccinated against Hepatitis B and tested for antibodies before she becomes pregnant. After the birth of the child, get the hepatitis B vaccine according to the state regulations until antibodies are produced. In life, blood and saliva should not come into direct contact, such as everyone’s wounds and whisker pickers. Other normal contact can be made, such as kissing the face, head and feet. If the child develops antibodies, it is impossible to transmit the infection except through blood transfusion. How to block father-to-child transmission of hepatitis B Since direct father-to-child transmission occurs at the germ cell stage, the most effective way to block father-to-child transmission of hepatitis B is through pre-pregnancy intervention. Newlyweds should be tested for Hepatitis B before marriage, and active treatment should be carried out regardless of whether either the man or the woman is suffering from Hepatitis B. The condition should be cured and not infectious or stabilized. Only after the condition is cured and not infected or stabilized can they get married and have children. If the mother can successfully immunize herself against Hepatitis B vaccine before pregnancy until antibodies appear, i.e., when the HBsAb reaches 400 units or more, then this is the best time to get pregnant, which can effectively protect the pregnant woman and the newborn baby, and thus can effectively reduce the possibility of being infected with the Hepatitis B virus. Newborns born to fathers and/or mothers who are hepatitis B carriers should be injected with high-efficiency hepatitis B immunoglobulin, 100 IU at a time, within 24 hours and one month after birth, in addition to the hepatitis B vaccine according to the regulations, in order to better protect the newborns.