Research indicates that 13 cytokines, including IL1, IL2, IL4, IL6, IL7, IL8, IL10, CSF3, IP-10, CCL2, CCL3, TNF-α, and IFN-γ (INF-II), are elevated in COVID-19 patients [15,16,17,18,19,20]. Here, IL2 is linked to COVID-19.