Impact of chronic cholecalciferol supplementation and vitamin D status on risk of post-vaccination SARS-CoV-2 breakthrough infection

DOI record: { "DOI": "10.1007/s12020-026-04677-6", "ISSN": [ "1559-0100" ], "URL": "http://dx.doi.org/10.1007/s12020-026-04677-6", "alternative-id": [ "4677" ], "article-number": "209", "assertion": [ { "group": { "label": "Article History", "name": "ArticleHistory" }, "label": "Received", "name": "received", "order": 1, "value": "22 March 2026" }, { "group": { "label": "Article History", "name": "ArticleHistory" }, "label": "Accepted", "name": "accepted", "order": 2, "value": "18 May 2026" }, { "group": { "label": "Article History", "name": "ArticleHistory" }, "label": "First Online", "name": "first_online", "order": 3, "value": "10 June 2026" }, { "group": { "label": "Declarations", "name": "EthicsHeading" }, "name": "Ethics", "order": 1 }, { "group": { "label": "Ethics approval", "name": "EthicsHeading" }, "name": "Ethics", "order": 2, "value": "The study-protocol complies with the Declaration of Helsinki and was approved by the hospital ethics committee (protocol no. CET 178-2023 ABIO/NC/06 ClinicalTrials.gov ID NCT06452082)." }, { "group": { "label": "Conflict of interest", "name": "EthicsHeading" }, "name": "Ethics", "order": 3, "value": "Andrea Giustina has occasionally consulted for Abiogen. Luigi di Filippo received research grant to Institution from Abiogen and his research activities are partly supported by Glucocorticoid induced Osteoporosis Skeletal (GIOSEG). All other authors have no conflict of interest to declare. 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