CAT and COVID-19: CAT enzymatic activity was significantly increased in the a-COVID-19 (p = 0.04, 1.1-fold increase) and s-COVID-19 (p = 0.013, 1.11-fold increase) groups compared to the CTRL group (Figure 3C), while no significant differences were reported between the a-COVID-19 and s-COVID-19 groups (p > 0.05).