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Background: Optimization of antimicrobial stewardship is key to tackling antimicrobial resistance, which is exacerbated by overprescription of antibiotics in pediatric emergency departments (EDs). We described patterns of empiric antibiotic use in European EDs and characterized appropriateness and consistency of prescribing., Methods: Between August 2016 and December 2019, febrile children attending EDs in 9 European countries with suspected infection were recruited into the PERFORM (Personalised Risk Assessment in Febrile Illness to Optimise Real-Life Management) study. Empiric systemic antibiotic use was determined in view of assigned final "bacterial" or "viral" phenotype. Antibiotics were classified according to the World Health Organization (WHO) AWaRe classification., Results: Of 2130 febrile episodes (excluding children with nonbacterial/nonviral phenotypes), 1549 (72.7%) were assigned a bacterial and 581 (27.3%) a viral phenotype. A total of 1318 of 1549 episodes (85.1%) with a bacterial and 269 of 581 (46.3%) with a viral phenotype received empiric systemic antibiotics (in the first 2 days of admission). Of those, the majority (87.8% in the bacterial and 87.0% in the viral group) received parenteral antibiotics. The top 3 antibiotics prescribed were third-generation cephalosporins, penicillins, and penicillin/β-lactamase inhibitor combinations. Of those treated with empiric systemic antibiotics in the viral group, 216 of 269 (80.3%) received ≥1 antibiotic in the "Watch" category., Conclusions: Differentiating bacterial from viral etiology in febrile illness on initial ED presentation remains challenging, resulting in a substantial overprescription of antibiotics. A significant proportion of patients with a viral phenotype received systemic antibiotics, predominantly classified as WHO Watch. Rapid and accurate point-of-care tests in the ED differentiating between bacterial and viral etiology could significantly improve antimicrobial stewardship., Competing Interests: Potential conflicts of interest. A. J. C. reports 2 grants from UK Research and Innovation (principal investigator), outside the submitted work, a grant from the National Institute of Health and Care Research (as joint lead of the Global Health Research Group), and a role as chair of the Committee for Scientific Affairs and Awards for European Society for Paediatric Infectious Disease. F. M-T. reports financial support for educational activities from Sanofi, MSD, Moderna, GlaxoSmithKline (GSK), Biofabri, AstraZeneca, Novavax, Janssen, and Pfizer, outside the submitted work; travel expenses and meeting fees covered by Pfizer, MSD, GSK, and Sanofi; participation on a data safety monitoring board or advisory board for Pfizer and Biofabri; ; roles as coordinator of Spanish Pediatric Critical Trials Network and coordinator of the World Health Organization (WHO) Collaborating Centre for Vaccine Safety of Santiago de Compostela; and roles as principal investigator in randomized controlled trials for Ablynx, Abbott, Seqirus, Sanofi, MSD, Merck, Pfizer, Roche, Regeneron, Jansen, Medimmune, Novavax, Novartis and GSK. A. J. P. reports consulting fees from Shionogi, outside the submitted work; grants or contracts paid to the institution from the Bill & Melinda Gates Foundation, the Wellcome Trust, Cepi, the Medical Research Council, and the National Institute for Health and Care Research; royalties or licenses from AstraZeneca (Oxford University has entered into a partnership with AstraZeneca for development of coronavirus disease 2019 [COVID-19] vaccines); and unpaid roles as chair of the Department of Health and Social Care's Joint Committee on Vaccination and Immunisation and as a member of the WHO Strategic Advisory Group of Experts on Immunization (SAGE) until 2022. P. K. A. A. was a member of the Sanofi advisory board for nirsevimab in 2022. M. N. T. reports consulting fees for an MSD advisory board, support for attending IDWeek 2022 from Pfizer and IDWeek 2023 from Janssen, and unpaid participation on the Scientific Advisory Group of Experts for COVID-19 (Greece) and the National Committee for immunization Practices (Greece). U. v. B. reports financial support for educational activities (lectures on antimicrobial stewardship; pediatric educational curricula) from MSD, outside the submitted work. All other authors report no potential conflicts. All authors have submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest. Conflicts that the editors consider relevant to the content of the manuscript have been disclosed., (© The Author(s) 2023. Published by Oxford University Press on behalf of Infectious Diseases Society of America.)