Mechanism of higher risk for COVID-19 in diabetes: a mask to lift.

PURPOSE: This essay aims to propose suggestions on what we can learn from previous investigations to conduct further studies on the potential mechanisms underlying the effect of diabetes mellitus on COVID-19. METHODS: We reviewed some literature on diabetes and other types of coronavirus infection such as Middle East respiratory syndrome (MERS) and severe acute respiratory syndrome (SARS) and made some summaries and comparisons. RESULTS: Diabetes affect the occurrence and progression of COVID-19. CONCLUSIONS: In-depth and comprehensive exploration of the mechanism of diabetes affecting COVID-19 should be carried out.