The high prevalence of meningitis is as follows: 1) children aged 6 months to 2 years with low immunity, whose own immune system is not yet perfected due to the gradual decline of antibodies brought by the mother; 2) adults with gastrointestinal diseases, chronic malnutrition, excessive fatigue, fondness for smoking and drinking, HIV infection, and tumors; 3) people who raise pigeons, who are prone to fungal meningitis; 4) people in remote and backward places, who are prone to tuberculous meningitis due to lack of awareness of tuberculosis vaccination and poor living habits.