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 u.s. gov't adult female male adolescent aged middle aged Comparative Study P.H.S. Clinical Trial Randomized Controlled Trial anti-bacterial agents / adverse effects microbial sensitivity tests agranulocytosis / complications* drug therapy fever / drug therapy* r e champlin bacterial infections / drug therapy* combination / therapeutic use fever / etiology anti-bacterial agents / therapeutic use* costs and cost analysis anti-bacterial agents / economics bacterial infections / etiology fever / microbiology gram-negative bacterial infections / drug therapy gram-positive bacterial infections / drug therapy piperacillin / therapeutic use pmid:1952471 doi:10.7326/0003-4819-115-11-849 d j winston w g ho cefoperazone / therapeutic use ceftazidime / therapeutic use imipenem / therapeutic use superinfection / etiology