A recent scoping review of 23 studies of post‐COVID‐19 patients suffering from persistent symptoms, including fatigue, dyspnea, myalgia, and sleep disorders, identified a set of biomarkers related to the immune response, including T‐lymphocytes CD4+, CD8+, interleukin (IL)‐6, and tumor necrosis factor alpha (TNF‐α) [8]. This evidence concerns the gene IL6 and COVID-19.