key: cord-0747270-x7rojtox authors: Yasri, Sora; Wiwanitkit, Viroj title: Subacute Thyroiditis After Covid-19 Vaccination date: 2022-01-24 journal: Enferm Infecc Microbiol Clin DOI: 10.1016/j.eimc.2021.12.010 sha: b08233e295280bb64049489a89cb8fc222cebf86 doc_id: 747270 cord_uid: x7rojtox nan we would like to share ideas on the publication "SUBACUTE THYROIDITIS AFTER ANTI SARS-COV-2 (Ad5-nCoV) VACCINE [1] ." Rebollar reported a case and mentioned for possible clinical association between thyroid problem and COVID-19 vaccination [1] . Thyroid problem might be followed vaccination and the pathogenesis is still inconclusive. Regarding subacute thyroiditis, there are sporadic case reports in COVID-19 vaccine recipients [2 -3] . The observed thyroid abnormality might or might not be associated with vaccination. After vaccination, the abnormal thyroid function might occur and it is not related to any immunological abnormality [4] . Hyperviscosity might occur after vaccination [4] and it can result in an aberrantly thyroid function [5] . Online ahead of print COVID-19 mRNA vaccine may trigger subacute thyroiditis COVID-19 vaccineassociated subacute thyroiditis: an unusual suspect for de Quervain's thyroiditis Abnormal Thyroid Function Following COVID-19 Vaccination Expected viscosity after COVID-19 vaccination, hyperviscosity and previous COVID-19 The authors ask for waiving for any charge relating to this correspondence.