ACE2 and hyperthyroidism: Although thyroid cells express angiotensin-converting enzyme 2 (ACE-2), the main protein that functions as a receptor to which SARS-CoV-2 binds to enter host cells, studies have shown that patients with controlled hypothyroidism and hyperthyroidism do not have a higher prevalence of COVID-19 nor do they have a worse prognosis when infected with the virus [8–11].