IL18 and endothelial dysfunction: Overall, CEC attributes of convalescent COVID-19 patients correlated with a vast majority of differentiation and activation factors associated with T cells and B cells (IL-4, IL-5, IL-7, IL-17A, IL-18, MIP-1α, and RANTES) (Turner et al., 2014), implicating a broad adaptive immune response with endothelial dysfunction.