Clinical studies have reported that various plasma cytokines and chemokines, such as IL1α, IL1β, IL6, IL10, IL16, IL17, IL23, IL33, IFNα, TNFα, CCL2, CCL3, CCL5, CCL20, CXCL2, CXCL3, CXCL10, and CXCL13, were increased in patients with COVID-19. Here, CCL2 is linked to COVID-19.