Fever usually lasts about 3 days after rabies vaccination in children, but the exact time varies from person to person and cannot be generalized. Usually, adverse reactions such as fever may occur after rabies vaccination, but the probability is low. If a child develops a fever after rabies vaccination but does not experience general discomfort, it is a normal human immune response and the body temperature is not too high, mainly low fever (37.3℃-38℃), which usually lasts 1-2 days and does not exceed 3 days. However, if the child’s temperature is high or if the fever persists for more than 3 days, he or she should be seen by a hospital emergency room in a timely manner. Children need to pay attention to rest after rabies vaccination, avoid overexertion, prohibit the consumption of spicy and stimulating food, and if low fever occurs, physical cooling by wiping with warm water can be appropriate.