A second dose of varicella vaccine is recommended for children. Chickenpox is a disease caused by initial infection with the varicella-zoster virus, and varicella vaccination is an effective means of preventing chickenpox and shingles. The varicella vaccine is usually given in two shots, the first at 12 months of age and the second at 4 weeks of age. Usually, the protection rate of children is about 80% after the first vaccination, and it can be increased to more than 95% if the children receive two doses of chickenpox vaccine. This will increase the probability of antibody production in the child’s body, and at the same time produce stronger resistance to diseases such as chickenpox, so there are no special circumstances, it is recommended that children receive a second dose of chickenpox vaccine. If the child has fever or during an acute or chronic serious illness, the vaccination may be delayed or suspended, and a specialized doctor can be consulted for details.