Common mtDNA variations at C5178a and A249d/T6392C/G10310A decrease the risk of severe COVID-19 in a Han Chinese population from Central China.

"Declarations Ethics approval and consent to participateThe study was approved by the Ethics Committee of Hubei University of Medicine (2020-TH-063 and 2020-TH-064). All the participants signed a written informed consent form to participate the project. Consent for publicationAll the authors have reviewed the final version of manuscript and signed a written consent form for publication. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by grants from the Special Project of Contingency Research for COVID-19 (No: 2020XGFYZR11), the Cultivating Project for Young Scholar at Hubei University of Medicine (No: 2018QDJZR01) awarded to Dr. Fuyun Ji, and the Special Project of Contingency Research for COVID-19 at Hubei University of Medicine (No: 2020XGFYZR03) awarded to Dr. Yunfu Wang. The funders had no role in study design, collection, analysis and interpretation of data, writing of the manuscript and in decision to submit the article for publication."