The differences between inactivated and attenuated live vaccines for encephalitis B include different principles of production, different doses of vaccination and different immunization cycles. 1. Different production principles: live attenuated B vaccine is a live vaccine made of bacteria and virus after treatment, which is not easy to be transported and preserved. Inactivated vaccine for encephalitis B is a dead vaccine, which is relatively easy to be transported and preserved, because the bacteria and viruses have lost their pathogenicity after treatment. 2. Different doses of vaccination: inactivated vaccine for encephalitis B usually needs to be vaccinated 4 times in order to get good immune effect, while live attenuated vaccine for encephalitis B has a longer effect on human body and usually only needs to be injected 2 times. 3. Different immunization cycles: the immunization effect of live attenuated B brain vaccine is better, and the protection cycle after vaccination is also longer. The inactivated vaccine is a vaccine made of dead virus, the immunization time is relatively short, usually need to be repeated once in 3 to 5 years. Different types of vaccines have their own advantages and disadvantages, and it is recommended to receive the appropriate vaccine according to your condition under the guidance of your doctor.