The meningococcal vaccine prevents meningitis caused by meningococci. There is a group A meningococcal vaccine and a group A group C meningococcal vaccine. These two types of vaccines prevent meningitis caused by meningococcus group A and meningitis caused by meningococcus groups A and C. Both vaccines belong to the first category and are provided by the government to citizens free of charge. The ACYW135 group of meningococcal polysaccharide vaccine, which belongs to category II vaccine, is voluntarily administered by citizens at their own expense, and is generally used for children over two weeks of age and adults in high-risk groups to receive two doses, one at three weeks of age and one at six weeks of age, to prevent meningitis caused by meningococci of groups A, C, Y, and W135. The price of the vaccine varies slightly from place to place, and is generally around 100 yuan a piece. Class I vaccine is mandatory, while parents choose Class II vaccine voluntarily. If the economic situation allows, choose Class II vaccine. The quadruple influenza vaccine can replace the free influenza vaccine in the immunization plan, while increasing the part of Y and W135 groups of influenza, so you can choose this vaccine if the economic situation allows. This will provide better protection against epidemic meningitis. There are two types of meningococcal vaccines for residents to choose from: Class I and Class II, so you can vaccinate your child according to your situation.