Meningismus is difficult to discern if <6mo, (esp if <2mo)
<3months old
1% incidence of bacterial<unk> in the developed world
E. coli, Group B strep, listeria
>3months old
S. pneumo, meningococcus, staph
Lower S. pneumo rates since Prevnar- if unvaccinated, cover for this
1% incidence of bacterial<unk> in the developed world
E. coli, Group B strep, listeria
S. pneumo, meningococcus, staph
Lower S. pneumo rates since Prevnar- if unvaccinated, cover for this
Otitis Media
Sinusitis
Immunosuppression/splenectomy
Alcoholism
Pneumonia
Diabetes Mellitus
CSF leak
Endocarditis
Neurosurgical procedure / head injury
Indwelling neurosurgical device / cochlear implant
Malignancy
Drug induced aseptic<unk> NSAIDs
Antimicrobials, see above page for list
NSAIDs
Antimicrobials, see above page for list
Meningitis 
Upper respiratory infection 
Encephalitis
UTI
Meningoencephalitis
Sepsis
Neoplastic meningitis
Meningitis