SUMF1 and COVID-19: Association analysis revealed that the risk of severe COVID-19 at the rs794185 site of the SUMF1 gene was significantly reduced using TT genotype as a reference in the Chinese Han population under the additive model after adjusting for gender and age (odds ratio [OR] for C allele = 0.62, 95% CI = 0.44–0.88, P = 0.0073, logistic regression).