The significance of meningococcal vaccine Meningococcal meningitis is a highly contagious disease that can cause great harm to the human nervous system. In severe cases, it may lead to paralysis, death and other consequences. The emergence of meningitis vaccine has greatly improved people\’s immunity and effectively protected people\’s health and safety. With the continuous improvement of science and technology, the performance and effect of meningococcal vaccine have also been continuously improved, becoming one of the indispensable vaccines for people. . The difference between free and self-paid markets