Etiology, clinical presentation, outcome and the effect of initial management in immunocompromised patients with community acquired bacterial meningitis.

•Immunocompromised state was observed in 33% of 1056 adults with bacterial meningitis.•The mortality was moderately increased in immunocompromised patients.•Atypical symptoms were more common in immunocompromised cases.•Delayed treatment was more common in the immunocompromised patients.•The mortality difference was reduced in patients given early adequate treatment.