National Center for Biotechnology Information NCBI NLM MEDLINE humans pubmed abstract nih national institutes of health national library of medicine logistic models research support non-u.s. gov't female male Child Infant Prospective Studies preschool Incidence bacteremia / mortality community-acquired infections / epidemiology community-acquired infections / microbiology hiv infections / epidemiology bacteremia / microbiology malnutrition / epidemiology hospitals kenya / epidemiology hospital mortality cause of death bacteria / isolation & purification malnutrition / complications j anthony g scott hiv infections / complications bacteremia / epidemiology* haemophilus infections / epidemiology haemophilus influenzae type b / isolation & purification pneumococcal infections / epidemiology james a berkley pmid:15635111 doi:10.1056/nejmoa040275 brett s lowe rural