National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine research support non-u.s. gov't adult female male aged middle aged Prospective Studies risk factors Causality Netherlands / epidemiology meningitis bacterial / microbiology* d van de beek bacterial / etiology cross infection / microbiology* cross infection / mortality j de gans glasgow coma scale bacterial / mortality pmid:17433493 doi:10.1016/j.jhin.2007.02.017 m weisfelt cross infection / etiology gram-negative bacterial infections / cerebrospinal fluid gram-positive bacterial infections / cerebrospinal fluid neurosurgical procedures / adverse effects