An autopsy study in five patients with SARS has shown marked destruction of the follicular and parafollicular thyroid cells.7 A retrospective study on 50 patients with COVID-19 demonstrated that the serum TSH and total T3 levels were significantly lower in COVID-19 patients compared with a healthy control group and non-COVID-19 pneumonia patients. The gene discussed is SLC25A5; the disease is severe acute respiratory syndrome.