Individuals with a weak immune system are most at risk. This includes individuals taking immunosuppressive medication, cancer patients, HIV patients, premature babies with very low birth weight, the elderly, etc. People who are at an increased risk of acquiring particular<unk>  infections in general may also be at an increased risk of developing<unk> , as the infection may in some cases spread to the central nervous system. People residing in the Midwestern United States, and Southwestern United States and Mexico are at an increased risk of infection with Histoplasma and Coccidioides, respectively.
Fungal meningitis
Aseptic meningitis
Herpesviral meningitis
Viral meningitis
Drug-induced aseptic meningitis
Tuberculous meningitis
Viral encephalitis
Herpesviral encephalitis