Plasma levels of IL-2, IL-7, IL-10, granulocytic stimulator, IP-10, human monocyte chemotactic protein 1, and human macrophage inflammatory protein 1α in ICU patients with COVID-19 are higher than those in mild patients, indicating strong correlation between cytokine storm and disease severity (Ma et al., 2020; Neurath, 2020; Au et al., 2021; Kumar et al., 2021). The gene discussed is IL7; the disease is COVID-19.