National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine prognosis research support non-u.s. gov't adult female male middle aged Prospective Studies risk factors Netherlands / epidemiology acute disease meningitis multivariate analysis streptococcus / isolation & purification fever / etiology diederik van de beek jan de gans bacterial / diagnosis* bacterial / microbiology staphylococcus / isolation & purification streptococcus pneumoniae / isolation & purification neck haemophilus influenzae / isolation & purification bacterial / mortality pmid:15509818 doi:10.1056/nejmoa040845 marinus vermeulen community-acquired infections / mortality consciousness disorders / etiology* haemophilus influenzae / classification headache / etiology* bacterial / complications neisseria meningitidis / isolation & purification