IL18 and COVID-19: A recent study demonstrated that active caspase-1 (Casp1p20), IL-1β, IL-18, IL-6, and lactate dehydrogenase (LDH) were increased in the serum of patients with COVID-19, and that Casp1p20 and IL-18 are products derived from inflammasomes (Rodrigues et al., 2021).