TGFB1 and COVID-19: Measuring TGF-β1 values in 22 non-critical and 36 critical hospitalized COVID-19 patients, the observed average values were 50.0 ± 7.9 pg/mL and 95.8 ± 18.9 pg/mL respectively; this difference was not statistically significant (p = 0.07), possibly due to the high variability of TGF-β1 levels in critical patients and to the limited patient numerosity.