{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T21:18:21Z","timestamp":1789075101374,"version":"build-2803163510"},"reference-count":32,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T00:00:00Z","timestamp":1780444800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["JCM"],"abstract":"<jats:p>Background\/Objectives: Quinolones are among the most frequently implicated antibiotics in immediate hypersensitivity reactions, yet diagnostic evaluation remains challenging and the real-world behaviour of patients after de-labeling has received little attention. We examined the diagnostic work-up, outcomes, and post-de-labeling drug-use behaviour of patients with suspected quinolone hypersensitivity. Methods: This single-centre ambispective study included 29 patients evaluated between January 2020 and April 2024. Clinical, demographic, skin test, and drug provocation test (DPT) data were extracted retrospectively. Patients in whom allergy had been excluded or a safe alternative identified were contacted by structured telephone interview between May and June 2025. Results: Anaphylaxis was the most common index reaction (42.9%), and ciprofloxacin was the most frequently implicated agent (57.1% of drug instances). Skin tests were positive in 84.2% of cases, but the positive predictive value in the DPT-tested subset was only 20.0%. Of the 12 reached patients, 11 had quinolone allergy excluded; among these, only 4 (36.4%) had reused the de-labeled quinolone, while 7 (63.6%) had avoided it, including 4 who declined it when clinically indicated. Conclusions: Quinolone skin tests show limited specificity, and successful de-labeling does not guarantee real-world drug use. Patient anxiety and counselling are central to effective management.<\/jats:p>","DOI":"10.3390\/jcm15114334","type":"journal-article","created":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T13:46:48Z","timestamp":1780494408000},"page":"4334","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Negative Test, Persistent Avoidance: Real-World Outcomes of Quinolone De-Labeling"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6613-6830","authenticated-orcid":false,"given":"Kutay","family":"K\u0131rd\u00f6k","sequence":"first","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ceyda","family":"Tunakan Dalg\u0131\u00e7","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5690-4090","authenticated-orcid":false,"given":"Rag\u0131p Fatih","family":"Kural","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9627-4281","authenticated-orcid":false,"given":"Z\u00fcleyha","family":"Galata","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6321-7317","authenticated-orcid":false,"given":"\u00dcmitcan","family":"Ate\u015f","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6181-951X","authenticated-orcid":false,"given":"T\u00fcrkan","family":"Dizdar Canbaz","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ecem","family":"Ay","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eda","family":"Aslan","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Meryem \u0130rem","family":"Toksoy \u015eent\u00fcrk","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seda","family":"Karaaslan Yetemen","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reyhan","family":"G\u00fcm\u00fc\u015fburun","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emine Nihal","family":"Mete G\u00f6kmen","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9199-1991","authenticated-orcid":false,"given":"Ayt\u00fcl Zerrin","family":"Sin","sequence":"additional","affiliation":[{"name":"Division of Immunology and Allergy, Department of Internal Medicine, Faculty of Medicine, Ege University, 35100 \u0130zmir, T\u00fcrkiye"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e00374-23","DOI":"10.1128\/aac.00374-23","article-title":"In-Class Cross-Reactivity Among Hospitalized Patients with Hypersensitivity Reactions to Fluoroquinolones","volume":"67","author":"Shah","year":"2023","journal-title":"Antimicrob. 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