Patients who have had the chickenpox vaccine do not need to be vaccinated again, and those who have had chickenpox do not need to be vaccinated again, because they can acquire antibodies after having chickenpox and achieve lasting immunity, and it is extremely rare to get sick again. However, the varicella-zoster virus, which is latent in the body, can be activated later and can cause shingles. Varicella is a respiratory disease, mainly transmitted by respiratory droplets, and can occur throughout the year, but mainly in the spring. Therefore, during the high season of the disease, for susceptible people, try not to go to crowded places to avoid contracting chickenpox. When contacting chickenpox patients, you should keep a certain distance, wear a mask and do self-protection, and preschool children are the high-risk group.