To describe cases that arrived to the pediatric ED with acute febrile illness (up to 7 days of fever) and the final diagnosis they received. To describe the antibiotic treatment given in the community as described in the anamnesis and referral letter, the concordance of the treatment to the therapeutic guidelines, the diagnosis given in the ED and the change in Antibiotic treatment, and the final diagnosis given after extended microbiologic tests were taken from a panel of infectious diseases specialists.