Some studies found that patients with severe COVID-19 exhibit higher levels of IL-2, IL-7, IL-10, Interferon gamma-induced protein 10 (IP-10), macrophage inflammatory protein 1 alpha (MIP1A), and granulocyte-colony stimulating factor (G-CSF) than patients with mild and moderate infections (Tay et al., 2020). Here, CCL3 is linked to infection.