IL7 and COVID-19: Similarly, high plasma level of IL-6 along with other proinflammatory cytokines, such as IL-2, IL-7, IL-8, IL-10, macrophage inflammatory protein (MIP1A), monocyte chemoattractant protein (MCP1), and TNF-alfa have been found in critically ill patients with COVID-19 and these cytokines significantly contribute in the severity of the disease [5,6,8].