IL7 and COVID-19: A previous study found that intensive care unit (ICU) patients with COVID-19 had higher plasma levels of interleukin (IL)-10, IL-2, IL-7, tumor necrosis factor (TNF)-α, IP-10, monocyte chemoattractant protein 1, Macrophage inflammatory protein 1A than those in non-ICU patients with COVID-19 [4].