The ac meningococcal vaccine is a pediatric vaccine used to prevent meningococcal infection. There are generally no serious local or systemic reactions after the injection of the rheumatic encephalitis ac vaccine. After vaccination of individual children, there is localized redness and hard nodules, systemic reactions with hypothermia, and occasional allergic reactions. Most of the vaccinees appear 10 to 24 hours after vaccination, and generally recover on their own in 1 to 2 days, with symptomatic treatment if necessary. If there are serious reactions, prompt medical treatment is required. If you have seizures, epilepsy or acute febrile diseases, you should not be vaccinated. Pay attention to the appropriate temperature in the room to avoid too low a temperature, which may cause the baby to catch a cold, and ensure sufficient sleep. Also pay attention to the baby’s body temperature and daily living conditions.