The chickenpox vaccine and still have chickenpox, in the clinic can be seen, and from the theory is also can appear. Because the preventive effect of the chickenpox vaccine is not 100%, and the antibodies that the chickenpox vaccine can make a person produce, will gradually decline over time, if it declines to a certain level, the chickenpox infected under the condition of low immunity, it is still possible to develop the disease. If the antibody drops to a certain amount, even if the immunity is normal, the chickenpox virus may still be infected when you come into contact with it. Don’t be afraid of getting chickenpox and get regular treatment. Because you have had the chickenpox vaccine before, it is likely that you will have less severe symptoms this time than if you had not gotten the chickenpox vaccine. So even if you get chickenpox after the vaccine, it is still possible.