Patients who have had chickenpox do not need to be vaccinated, but if they have a history of high-risk exposure to the varicella virus, they can be selectively vaccinated according to their own situation. Chickenpox is caused by varicella-herpes zoster virus, the disease is infectious and self-limiting, people who have had chickenpox body will produce corresponding antibodies, get immunity, such immunization is effective for life, no recurrence. Therefore, people who have had chickenpox can be prevented without chickenpox vaccination. Patients who have had chickenpox, the virus can be latent in the body for a long time, in the body resistance weakened, re-exposure to chickenpox virus, the virus may be activated, triggering herpes zoster, so the patient can be under the guidance of the doctor in conjunction with their own situation selective vaccination. If the diagnosis of chickenpox is confirmed, it is necessary to consult a doctor in time for medical treatment, isolation treatment, and professional treatment under the guidance of a doctor to avoid causing large-scale infection.