IL15 and COVID-19: Third/fourth vaccination with Comirnaty® and Spikevax [80], two doses of COVID-19 mRNA-based vaccines (BNT162b2 (Pfizer-BioNTech) or mRNA-1273 (Moderna)) [81], single dose COVID-19 vaccination with inactivated vaccines (CoronaVac, BBIBP-CorV, or WIBP-CorV) [82], and first and second dose of BNT162b2 mRNA [83] showed a significant in IL-2 family expression, including IL-2 and IL-15 which lead to partial viral immunity in vaccinated individuals.