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Many cases of subacute thyroiditis (SAT) have been described related to SARS-CoV-2 infection, but no prospective data about follow-up is known. This prospective, longitudinal, 3-year, multicentre study is aimed at exploring clinical peculiarities and outcome of SAT in relation to SARS-CoV-2 infection, ascertained with antibody dosage. All patients receiving SAT diagnosis from November 2020 to May 2022 were enrolled. Multicentre study. Data about anamnesis, physical examination, blood tests (TSH, freeT4, freeT3, thyroglobulin, anti-thyroid antibodies, C-reactive protein, erythrocyte sedimentation rate, complete blood count), and thyroid ultrasound were collected. At baseline, the presence of IgG against the SARS-CoV-2 spike protein or nucleocapside was investigated. Patients were evaluated after 1, 3, 6, 12 months.
