TNF and COVID-19: 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].