Meningococcal infection is a preventable disease. There are 2 types of meningococcal vaccines available in Hong Kong. One cover meningitis ACWY and the other cover meningitis B. Both vaccines are not yet included in the Hong Kong Childhood Immunisation Programme (HKCIP). The number of reported cases in China has steadily declined since meningococcal A and C vaccine was introduced to the Expanded Programme on Immunisation (EPI) since 2008, with the proportion of MenA and C cases began to decline and MenB to rise. In 2018, 50% of meningococcal infection in Hong Kong was caused by serogroup B, followed by 20%, 20% and 10% of serogroup C, Y and W-135. Since meningitis B vaccine was not available in Hong Kong until Jun, 2019, the vaccine most people may have received when they were younger covered meningitis ACWY only.