Usually the reactions after the HFMD vaccine are as follows: 1. The most common factor and the most common clinical reaction is a mild fever. If the child’s body temperature is within 37.5°C after the vaccine, it is usually normal, but if the child’s body temperature rises above 38.5°C after the vaccine, he or she needs to go to the hospital immediately to see if it is a reaction to the rejection of the virus after the injection. 2. 2.If localized nodules and wind masses appear after the HFMD vaccine, they are also normal reactions, because the nodules caused by the local immune reaction to the injection usually disappear within 3 days. 3.Usually after the HFMD vaccine, the child will appear fatigue, laziness, anorexia and other situations are also normal reactions. 4.Very few children will appear, such as anaphylaxis, syncope, metabolic reactions and other threats. 4. Very few children will have life-threatening systemic infections such as anaphylaxis, syncope, and allergic reactions.