However, thyrotoxicosis (15–20% of cases) and low serum TSH and 3,5,3′-triiodothyronine levels (compared with those of a healthy control group) have been reported in patients with COVID-19, and they have been found to be significantly associated with increased IL-6 serum levels in these patients and with the severity of the disease [16,23,27,28]. The gene discussed is IL6; the disease is COVID-19.