CCL2 and COVID-19: Severely ill patients hospitalised with COVID-19 exhibit increased levels of Interleukin (IL)-1β, IL-2, IL-6, IL-7, IL-8, IL-10, IL-17, granulocyte colony stimulating factor (G-CSF), monocyte chemoattractant protein 1 (MCP-1) and tumor necrosis factor (TNF) [1,3,7,8,9,10,11,12,13].