Living in a crowded setting, such as a dormitory or child care facility (for meningococcal meningitis)Age -- children, young people and older adults are more likely to develop meningitis.Significant head injury, skull trauma, or cerebrospinal rhinorrhea (flow of cerebrospinal fluid from the nose after a head injury)A suppressed immune system (for pneumococcal meningitis)Never receiving the HiB vac