Abstract
Background: Unknown fever (UF) is a frequent pathology in children and its main etiology are viral infe ctions. The identification of bacterial infection with antibiotics requirements is still on debate. Objective: Determine the characteristics of patients with suspicion of an invasive bacterial infection (IBI) and evaluate the contribution of C reactive protein (CRP) and leukocytes with absolute neutrophyl count (ANC). Method: Prospective-descriptive study of 640 patients between 6 weeks and 36 months-old, with UF and IBI suspicion, admitted in Infectology from the Emergency Room of Hospital Sotero del Rio between 2005 - 2007. Results: 53,7% of cases had a confirmed IBI, most commonly urinary tract infection (80,17%). A significantly difference was found between CRP, leukocytes and ANC, but the Roe curve did not show a relevant difference. It was not possible to determine a specific level of CRP, leukocytes and ANC for a better IBI discrimination.
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