Meningococcal vaccine is mainly used for the prevention of epidemic cerebrospinal meningitis, some children will have adverse reactions such as redness at the injection site after vaccination, and children suffering from acute infectious diseases and allergy are not recommended to be vaccinated. Meningitis is an acute suppurative meningitis caused by meningococcal infection, in which children will have fever, severe headache, vomiting and other uncomfortable symptoms, and the meningitis vaccine can prevent suppurative meningitis and other serious diseases. Meningococcal vaccine is applicable to children between 6 months of age and 2 years of age. Some children will have adverse reactions such as redness and pressure pain at the injection site after vaccination. It should be noted that if the child is in an acute infectious disease attack, has fever and other symptoms, or suffers from kidney disease and other diseases can not be vaccinated to avoid aggravating the condition. In addition, children who are allergic to the vaccine are prohibited from receiving the vaccine to prevent allergic symptoms such as respiratory distress, shock and generalized itching. Parents should take their children to the hospital to consult the doctor before following the doctor’s advice for vaccination.