Therefore, IL-6 can be considered a useful biomarker in diagnosis infection and cardiovascular diseases [22,23], different kinds of cancer [24,25], and other diseases such as lung fibrosis [26], chronic intestinal inflammation [27], acute kidney injury (AKI), chronic kidney disease (CKD) [28,29,30] and, recently, COVID-19 [31]. This evidence concerns the gene IL6 and COVID-19.