The upregulation of miR-146a and miR-155 in the oral cavities of patients with diabetes and periodontitis, as reported by Jelena R. Roganovic, has been suggested to potentially enhance the expression of angiotensin-converting enzyme 2 (ACE2) and alter the host’s antiviral response to the SARS-CoV-2 virus [113]. Here, ACE2 is linked to diabetes mellitus.