The varicella vaccine requires two shots. For children between 12 months and 12 years of age, the first recommended injection is given at 12-18 months of age and the second at 3-4 years of age. Varicella is a group of respiratory infections contracted by the varicella zoster virus, and it is recommended that the varicella vaccine be given as early as possible when available. Currently, most varicella vaccines require only two doses, and most people are immunized for life after two doses. Chickenpox does not usually reoccur after chickenpox vaccination, but individual children can still develop chickenpox. When chickenpox occurs, it can be accompanied by fever, and at the same time, there are weakness, drowsiness, limb aches and pains, etc. Symptomatic cooling, pay attention to do not let the child scratch the blisters, and do not go to friction to touch, do a good job of isolation. After chickenpox vaccination, some children may have low-grade fever, rash, nausea, vomiting and other adverse reactions. If the symptoms are mild, they can be observed; if the symptoms are more serious, it is recommended to go to the hospital in time and actively cooperate with the doctor for treatment.