Clinical characteristics of the COVID-19 (n = 6), H1N1 (n = 10), and CONTROL (n = 11) groups as gender, age, time from hospitalization to death, comorbidities, histopathological patterns, and the tissue expression of IL-4, IL-13, TGF-B, and M2 macrophages score are listed in Table 2. Here, TGFB1 is linked to COVID-19.