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Follow-up, diagnosis, and outcomes of fever of unknown origin cases in whom no diagnosis was established after initial evaluation: an ID-IRI (Infectious Diseases - International Research Initiative) observational retrospective cohort study.

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Title: Follow-up, diagnosis, and outcomes of fever of unknown origin cases in whom no diagnosis was established after initial evaluation: an ID-IRI (Infectious Diseases - International Research Initiative) observational retrospective cohort study.
Authors: Elbahr U; Department of Infectious Diseases, Bahrain Oncology Center, King Hamad University Hospital, Muharraq, Bahrain. drumran_08@hotmail.com., Erdem H; Department of Infectious Diseases and Clinical Microbiology, Gulhane School of Medicine, Turkish Health Sciences University, Ankara, Turkey., Letaief A; Department of Infectious Diseases, Farhat Hached University Hospital, Ibn El Jazzar Medical School, University of Sousse, Sousse, Tunisia., Grgić S; Department of Infectious Diseases, University Clinical Hospital Mostar, Mostar, Bosnia and Herzegovina., Zambrano LI; Department of Morphological Sciences, Faculty of Medical Sciences (FCM), National Autonomous University of Honduras (UNAH), GRINVAR Research Group, Tegucigalpa, Honduras., Yahia WB; Department of Internal Medicine, Farhat Hached University Hospital, Ibn El Jazzar Medical School, University of Sousse, Sousse, Tunisia., Rahimi BA; Department of Infectious Diseases, Kandahar University Medical Faculty, Teaching Hospital, Kandahar, Afghanistan., Baymakova M; Department of Infectious Diseases, Military Medical Academy, Sofia, Bulgaria., Khedr R; Department of Pediatric Oncology, National Cancer Institute - Cairo University, Children Cancer Hospital Egypt, Cairo, Egypt., Nsutebu E; Tropical and Infectious Diseases Division, Sheikh Shakhbout Medical City, Abu Dhabi, United Arab Emirates., Şanlıdağ G; Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Ege University, Bornova, Izmir, Turkey., Koç MM; Department of Infectious Diseases & Clinical Microbiology, School of Medicine, Bezmialem Vakif University, Istanbul, Turkey., Öncü S; Department of Infectious Diseases & Clinical Microbiology, School of Medicine, Adnan Menderes University, Aydin, Turkey., Poposki K; Faculty of Medicine, University Clinic for Infectious Diseases and Febrile Conditions, Skopje, Republic of North Macedonia., Eser-Karlıdağ G; Department of Infectious Diseases and Clinical Microbiology, University of Health Sciences, Elazığ Fethi Sekin City Hospital, Elazığ, Turkey., Sipahi OR; Department of Infectious Diseases, Bahrain Oncology Center, King Hamad University Hospital, Muharraq, Bahrain.; Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Ege University, Bornova, Izmir, Turkey.
Source: BMC infectious diseases [BMC Infect Dis] 2026 May 11; Vol. 26 (1). Date of Electronic Publication: 2026 May 11.
Publication Type: Journal Article; Observational Study; Multicenter Study
Journal Info: Publisher: BioMed Central Country of Publication: England NLM ID: 100968551 Publication Model: Electronic Cited Medium: Internet ISSN: 1471-2334 (Electronic) Linking ISSN: 14712334 NLM ISO Abbreviation: BMC Infect Dis Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: Follow-up, diagnosis, and outcomes of fever of unknown origin cases in whom no diagnosis was established after initial evaluation: an ID-IRI (Infectious Diseases - International Research Initiative) observational retrospective cohort study.
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  Data: <searchLink fieldCode="AU" term="%22Elbahr+U%22">Elbahr U</searchLink>; Department of Infectious Diseases, Bahrain Oncology Center, King Hamad University Hospital, Muharraq, Bahrain. drumran_08@hotmail.com.<br /><searchLink fieldCode="AU" term="%22Erdem+H%22">Erdem H</searchLink>; Department of Infectious Diseases and Clinical Microbiology, Gulhane School of Medicine, Turkish Health Sciences University, Ankara, Turkey.<br /><searchLink fieldCode="AU" term="%22Letaief+A%22">Letaief A</searchLink>; Department of Infectious Diseases, Farhat Hached University Hospital, Ibn El Jazzar Medical School, University of Sousse, Sousse, Tunisia.<br /><searchLink fieldCode="AU" term="%22Grgić+S%22">Grgić S</searchLink>; Department of Infectious Diseases, University Clinical Hospital Mostar, Mostar, Bosnia and Herzegovina.<br /><searchLink fieldCode="AU" term="%22Zambrano+LI%22">Zambrano LI</searchLink>; Department of Morphological Sciences, Faculty of Medical Sciences (FCM), National Autonomous University of Honduras (UNAH), GRINVAR Research Group, Tegucigalpa, Honduras.<br /><searchLink fieldCode="AU" term="%22Yahia+WB%22">Yahia WB</searchLink>; Department of Internal Medicine, Farhat Hached University Hospital, Ibn El Jazzar Medical School, University of Sousse, Sousse, Tunisia.<br /><searchLink fieldCode="AU" term="%22Rahimi+BA%22">Rahimi BA</searchLink>; Department of Infectious Diseases, Kandahar University Medical Faculty, Teaching Hospital, Kandahar, Afghanistan.<br /><searchLink fieldCode="AU" term="%22Baymakova+M%22">Baymakova M</searchLink>; Department of Infectious Diseases, Military Medical Academy, Sofia, Bulgaria.<br /><searchLink fieldCode="AU" term="%22Khedr+R%22">Khedr R</searchLink>; Department of Pediatric Oncology, National Cancer Institute - Cairo University, Children Cancer Hospital Egypt, Cairo, Egypt.<br /><searchLink fieldCode="AU" term="%22Nsutebu+E%22">Nsutebu E</searchLink>; Tropical and Infectious Diseases Division, Sheikh Shakhbout Medical City, Abu Dhabi, United Arab Emirates.<br /><searchLink fieldCode="AU" term="%22Şanlıdağ+G%22">Şanlıdağ G</searchLink>; Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Ege University, Bornova, Izmir, Turkey.<br /><searchLink fieldCode="AU" term="%22Koç+MM%22">Koç MM</searchLink>; Department of Infectious Diseases & Clinical Microbiology, School of Medicine, Bezmialem Vakif University, Istanbul, Turkey.<br /><searchLink fieldCode="AU" term="%22Öncü+S%22">Öncü S</searchLink>; Department of Infectious Diseases & Clinical Microbiology, School of Medicine, Adnan Menderes University, Aydin, Turkey.<br /><searchLink fieldCode="AU" term="%22Poposki+K%22">Poposki K</searchLink>; Faculty of Medicine, University Clinic for Infectious Diseases and Febrile Conditions, Skopje, Republic of North Macedonia.<br /><searchLink fieldCode="AU" term="%22Eser-Karlıdağ+G%22">Eser-Karlıdağ G</searchLink>; Department of Infectious Diseases and Clinical Microbiology, University of Health Sciences, Elazığ Fethi Sekin City Hospital, Elazığ, Turkey.<br /><searchLink fieldCode="AU" term="%22Sipahi+OR%22">Sipahi OR</searchLink>; Department of Infectious Diseases, Bahrain Oncology Center, King Hamad University Hospital, Muharraq, Bahrain.; Department of Infectious Diseases and Clinical Microbiology, Faculty of Medicine, Ege University, Bornova, Izmir, Turkey.
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  Data: <searchLink fieldCode="JN" term="%22100968551%22">BMC infectious diseases</searchLink> [BMC Infect Dis] 2026 May 11; Vol. 26 (1). <i>Date of Electronic Publication: </i>2026 May 11.
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  Data: Journal Article; Observational Study; Multicenter Study
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22BioMed+Central%22">BioMed Central </searchLink><i>Country of Publication: </i>England <i>NLM ID: </i>100968551 <i>Publication Model: </i>Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1471-2334 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2214712334%22">14712334 </searchLink><i>NLM ISO Abbreviation: </i>BMC Infect Dis <i>Subsets: </i>MEDLINE
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