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(a) The thiol concentrations significantly decreased in the moderate and severe COVID-19 patients in comparison to HS. (b) GSH concentration statistically decreased in the moderate and severe COVID-19 patients in comparison with HS. (c) The Se concentration significantly decreased in both the moderate and severe COVID-19 patients in comparison with HS. Abbreviations: HS = healthy subjects, GSH = glutathione, Se = selenium.
