Chickenpox vaccination usually does not cause chickenpox, but a few people still get chickenpox. Varicella vaccine is a live attenuated vaccine, after vaccination, the body can produce resistance to varicella-zoster virus, the vaccine in the 6 weeks after vaccination seropositive rate of more than 98%, for the vaccination of the person’s protection is relatively strong, any vaccine can not do 100% protection, varicella vaccine is no exception. Therefore, a small number of people may remain infected after vaccination. However, vaccinated infected people have a relatively mild onset of disease compared to unvaccinated people, with a relatively low temperature or no fever, atypical chickenpox, a relatively small rash, and fewer accompanying symptoms. Chickenpox is a contagious disease, and after infection it is important to isolate the patient until the blisters are completely dry and crusted over, and to avoid contact with people during this time. Although the vaccine does not provide 100% protection, vaccination is still recommended.