We suggest to perform urine analysis and culture as the initial study for children with acute FUO and well clinical condition.

Clinical presentation of Febrile Syndrome Without Apparent Focus and bacterial infection suspicion in children between 6 weeks and 36 months-old Background: Unknown fever (UF) is a frequent pathology in children and its main etiology are viral infections. 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 Sótero del Río 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 Roc 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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