National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine treatment outcome research support non-u.s. gov't adult female male adolescent aged middle aged young adult Incidence Netherlands / epidemiology community-acquired infections / drug therapy Cohort Studies meningitis time factors odds ratio bacteria / isolation & purification bacterial / drug therapy bacterial / microbiology* community-acquired infections / epidemiology* diederik van de beek community-acquired infections / microbiology* bacteria / classification dexamethasone / therapeutic use bacterial / epidemiology* matthijs c brouwer serogroup pmid:26652862 doi:10.1016/s1473-3099(15)00430-2 merijn w bijlsma anti-inflammatory agents / therapeutic use