The receptor angiotensin-converting enzyme 2 (ACE2), which modulates the invasion of SARS-CoV-2 into the body, is also expressed in many vital metabolic organs and tissues, including pancreatic β cells (42), adipose tissue (43), intestines (44), and kidneys (44); SARS-CoV-2 infection may cause pleiotropic changes in glucose metabolism, complicate the pathophysiology of existing diabetes, or cause new hyperglycemia or new diabetes (45). Here, ACE2 is linked to diabetes mellitus.