People who have had chickenpox are generally not re-infected. Chickenpox is an acute infectious disease caused by varicella-herpes zoster virus infection, the patient is the main source of infection, mainly through respiratory droplets and direct and indirect contact transmission, the population is generally susceptible to children and adolescents as a high incidence of the population, the main clinical manifestations of the whole body at the same time herpes, blisters, scabs. Chickenpox has a certain self-limiting, after the infection can obtain lasting immunity, generally rarely have a second attack, so people who have had chickenpox again contact with the virus, generally will not be infected. However, the varicella-zoster virus can lie dormant in the body, and in adulthood, if the body’s immune system declines, it may lead to reactivation of the virus, which can lead to the development of shingles disease. Chickenpox and shingles are two different diseases caused by the same viral infection.