If children are vaccinated with group A+C influenza vaccine, they will have the following adverse reactions: 1. First, they will show local adverse reactions to vaccination. After children are vaccinated with influenza vaccine, redness, swelling, heat, pain and even itchiness will appear at the vaccination site, and children will also have pus. 2, secondly, systemic adverse reactions. The rheumatic encephalitis vaccine can cause children to have fever, headache, vomiting, diarrhea and other adverse reactions, and even the desire to sleep. For the adverse reactions to the flu vaccine, if it is relatively mild, you can carry out local disinfection, give children appropriate more warm water, more rest, most of them can get better within 3-5 days. If it is more serious, go to the hospital in time.