What is the transmission way of hepatitis B? Should be how to prevent?

        The main transmission routes of hepatitis B (1) live close contact with the transmission: HBV can be discharged through a variety of secretion of liquid to the outside. Which blood, saliva, semen, vaginal secretions are the most common. Sexual transmission occupies a very important position in the occurrence of hepatitis B.         iatrogenic transmission of medical devices and other products, mainly through blood transfusion or blood products, or by the patient's blood or body fluid. (3) perinatal transmission: the main risk factors of intrauterine transmission are maternal blood HBeAg and HBVDNA, and pre S2 positive. Maternal blood in the three at the same time, increased the risk of intrauterine transmission.

        Prevention of hepatitis B in addition to preventing iatrogenic transmission, strengthen blood donors and blood products to manage these non specific preventive measures, the main should take specific immune prevention. There are 2 products to prevent hepatitis B. (1) hepatitis B vaccine: the fundamental way to control hepatitis B. Blood vaccines for the source of raw materials shortage, high cost, limited production. In recent years, the use of biological engineering technology or DNA recombinant technology, to create a HBsAg gene engineering vaccine. Hundreds of millions of people have been vaccinated, it is safe and effective to prove this vaccine. Vaccination should be relaxed, where the negative of HBV markers should be vaccinated. Immune pathways have muscle, subcutaneous and intradermal injection of various. But does not advocate hip injection. The immune method of 3 needle low dose vaccine currently used for intradermal injection. According to 0, 1, June program injection of genetically engineered hepatitis B vaccine 5ug. (2) high titer hepatitis B immunoglobulin (HBIG): emergency prevention for certain groups of people. Injection of 2 - 3 hours after the blood circulation in the anti - HBs up to the level of protection, 2 - 5 Tianda peak, the average half-life of 24. 0 + 3. 8 days. Medical injury, should be in the same day and in January after the injection of the 1 HBIG, the dose of 0.06ml/kg.