Many people ask the following questions: 1. My colleague is a carrier of Hepatitis B virus (HBV), can I have dinner with him? 2.My mother-in-law is a hepatitis B carrier, I am pregnant now, can I ask her to help with the baby in the future? 3.My boyfriend is a hepatitis B carrier, and we are going to get married, is there anything I should pay attention to? Can we have children? To answer these questions, we need to clarify two issues: 1. How is the hepatitis B virus transmitted? Hepatitis B virus is transmitted through the blood, there are three ways of transmission: the blood route, the sexual route, mother-to-child transmission. The mother-to-child transmission route is also mainly through the mother’s blood to spread. The general contact in daily life, including shaking hands, hugging, eating, etc., is not contagious. 2.What does the infectiousness of a hepatitis B carrier depend on? Whether a hepatitis B virus carrier is infectious depends on the quantitative hepatitis B virus in his/her blood, that is, the HBVDNA level: if the HBVDNA is positive, the person’s blood is infectious, and the higher the HBVDNA level, the stronger the infectiousness; if the HBVDNA is negative, the person’s blood is not infectious. Figure out the transmission route of hepatitis B virus and the determinants of the size of infectiousness, you can answer the above questions: 1. It should be safe to eat with HBV carriers. There is only one situation where it is possible to be infectious, and that is when the HBV carrier’s blood HBVDNA level is relatively high, and the HBV carrier has an obvious break/wound inside the mouth with active bleeding, and his or her blood comes into contact with the cutlery, after which this cutlery comes into contact with the break inside the mouth of other people who are eating together – -This situation is actually transmitted through blood. To avoid being infected in this case, it is actually very simple to take the hepatitis B vaccine yourself, after the production of hepatitis B surface antibody is safe, you no longer have to worry about being infected. 2, on the issue of newborn babies and HBV carriers contact, if this baby’s grandmother’s blood is positive for HBVDNA, then it is best not to have too close contact with the baby before the full moon, because our country now newborns are vaccinated against hepatitis B, the first shot at birth and the second shot at full moon. Before the full moon, the baby may not have produced enough protective antibodies, and it is still possible to be infected through tiny wounds in the skin mucosa at this time. After the second dose of hepatitis B vaccine, the baby will generally produce more stable hepatitis B surface antibodies, and will have resistance to the hepatitis B virus, and will not be afraid of being infected. Of course, if the grandmother’s HBVDNA is negative, then there is no need to worry about being infectious at all, that is, you can take care of the baby. 3, the hepatitis B virus can be transmitted through the sexual route, so if this girl’s boyfriend is positive for HBVDNA in his blood, then it is possible to transmit the hepatitis B virus to her through the sexual route, while if his HBVDNA is negative, then there is absolutely no need to worry about being infected by him. The girl should do is to check her own hepatitis B five and liver function, if the liver function is normal, and all five hepatitis B negative, you need to take the hepatitis B vaccine as soon as possible, after the production of hepatitis B surface antibody will not worry about being infected, and the woman has hepatitis B surface antibody, if the future pregnancy, the baby is not likely to be infected with the hepatitis B virus. To sum up, the easiest way to be safe and not get infected by the hepatitis B virus is to get the hepatitis B vaccine yourself and wait until you have surface antibodies to hepatitis B so you don’t have to worry about getting infected. In fact, it’s really easy to prevent hepatitis B, so there’s absolutely no need for people to avoid people with the hepatitis B virus.