Abstract: nutrients Article Vitamin D Serum Levels in Subjects Tested for SARS-CoV-2: What Are the Differences among Acute, Healed, and Negative COVID-19 Patients? A Multicenter Real-Practice Study Luca Gallelli 1,‡ , Gaia Chiara Mannino 2,‡ , Filippo Luciani 3 , Alessandro de Sire 4, * , Elettra Mancuso 2 , Pietro Gangemi 5 , Lucio Cosco 6 , Giuseppe Monea 2 , Carolina Averta 2 , Pasquale Minchella 7 , Manuela Colosimo 7 , Lucia Muraca 8 , Federico Longhini 9 , Antonio Ammendolia 4 , Francesco Andreozzi 2, * , Giovambattista De Sarro 1 , G&P Working Group † and Erika Cione 10 1 2 3 4



 5 Citation: Gallelli, L.; Mannino, G.C.; Luciani, F.; de Sire, A.; Mancuso, E.; Gangemi, P.; Cosco, L.; Monea, G.; 6 7 Averta, C.; Minchella, P.; et al. Vitamin D Serum Levels in Subjects 8 Tested for SARS-CoV-2: What Are the 9 Differences among Acute, Healed, and Negative COVID-19 Patients? 10 A Multicenter Real-Practice Study. Nutrients 2021, 13, 3932. https:// * doi.org/10.3390/nu13113932 Academic Editors: Igor Sergeev and † ‡ Department of Health Science, School of Medicine, University of Catanzaro, Operative Unit of Clinical Pharmacology, Mater Domini University Hospital, 88100 Catanzaro, Italy; gallelli@unicz.it (L.G.); desarro@unicz.it (G.D.S.) Department of Medical and Surgical Sciences, University Magna Graecia of Catanzaro, 88100 Catanzaro, Italy; gaiamannino@gmail.com (G.C.M.); elettramancuso@gmail.com (E.M.); giuseppe.monea93@gmail.com (G.M.); carolinaaverta90@gmail.com (C.A.) Infectious Diseases Unit of Annunziata Hospital, 87100 Cosenza, Italy; filippoluciani@gmail.com Physical Medicine and Rehabilitation Unit, Department of Medical and Surgical Sciences, University of Catanzaro “Magna Graecia”, 88100 Catanzaro, Italy; ammendolia@unicz.it Operative Unit of Clinical Chemistry Laboratory, Pugliese Ciaccio Hospital, 88100 Catanzaro, Italy; pgangemi@aocz.it Department of Infectious Disease, Pugliese Ciaccio Hospital, 88100 Catanzaro, Italy; malattie.infettive@aocatanzaro.it Department of Microbiology and Virology, Pugliese Ciaccio Hospital, 88100 Catanzaro, Italy; minchellap@tin.it (P.M.); manuelacolosimo@hotmail.it (M.C.) Department of General Medicine, ASP 7, 88100 Catanzaro, Italy; luciamuraca@alice.it Department of Anesthesiology and Reanimation, Pugliese Ciaccio Hospital, 88100 Catanzaro, Italy; flonghini@unicz.it Department of Pharmacy, Health and Nutritional Sciences, Department of Excellence 2018–2022, University of Calabria, 87036 Cosenza, Italy; erika.cione@unical.it Correspondence: alessandro.desire@unicz.it (A.d.S.); andreozzi@unicz.it (F.A.); Tel.: +39-0961-7128-19 (A.d.S.); +39-0961-36471-20 (F.A.) A complete list of the centers and investigators in the G&P Working Group is provided in Appendix A. These authors contributed equally to this work. Maria Luz Fernandez Received: 7 October 2021 Accepted: 1 November 2021 Published: 3 November 2021 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). Abstract: Vitamin D might play a role in counteracting COVID-19, albeit strong evidence is still lacking in the literature. The present multicenter real-practice study aimed to evaluate the..