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. 2021 May 15;12(5):642–650. doi: 10.4239/wjd.v12.i5.642

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©The Author(s) 2021. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/Licenses/by-nc/4.0/

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Pre-existing diabetes mellitus can aggravate coronavirus disease 2019, following severe acute respiratory syndrome coronavirus 2 infection, whereas coronavirus disease 2019 can lead to hyperglycemia — even in the absence of diabetes mellitus, which is associated with worse prognosis. DM: Diabetes mellitus; COVID-19: Coronavirus disease 2019; H-GLU: Hyperglycemia; SARS-CoV-2: Severe acute respiratory syndrome coronavirus 2.