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 female male adolescent Comorbidity Child Infant Prospective Studies newborn preschool risk factors Incidence hospitalization bacteremia / microbiology microbial sensitivity tests survival rate gram-negative bacterial infections / diagnosis gram-negative bacterial infections / microbiology developing countries anti-bacterial agents / pharmacology anti-bacterial agents / administration & dosage bacteremia / epidemiology* bacteremia / drug therapy gram-negative bacterial infections / epidemiology* gram-positive bacterial infections / epidemiology* gram-negative bacterial infections / drug therapy gram-positive bacterial infections / diagnosis gram-positive bacterial infections / drug therapy bacteremia / diagnosis africa / epidemiology gram-positive bacterial infections / microbiology pmid:10783021 doi:10.1097/00006454-200004000-00010 a l walsh a j phiri m e molyneux fever of unknown origin / epidemiology*