Your immune system : the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies. fights for you and protects you against infectious disease. Your immune response is measured through inflammation and associated markers. When you have a cold, your inflammatory markers elevate. The elevate more so if you have the flu. In COVID-19 \ ˈkō-vid-nīn-ˈtēn : a mild to severe respiratory illness that is caused by a coronavirus (Severe acute respiratory syndrome coronavirus 2 of the genus Betacoronavirus), is transmitted chiefly by contact with infectious material (such as respiratory droplets), and is characterized especially by fever, cough, and shortness of breath and may progress to pneumonia and respiratory failure. , patients who are profoundly ill or die, experience a tragically high increase in inflammation and we call that a “cytokine storm.” Please note that COVID-19 is NOT special. The markers that elevate in COVID-19 are the same that elevate in any infectious disease. However, in COVID-19, in instances of severe disease, the go up to levels that can cause significant collateral damage and may lead quickly to death from the disease. The main cause(s) of death in the coronavirus co·ro·na·vi·rus : any of a family (Coronaviridae) of single-stranded RNA viruses that have a lipid envelope studded with club-shaped projections, infect birds and many mammals including humans, and include the causative agents of MERS, SARS, and COVID-19 and the disease, COVID-19, is edema, necrosis of lung tissue, or hypoxia (lack of oxygen supplied by the blood). Everyone has some level of low-grade inflammation, the level of which may predict your vulnerability to severe COVID-19 symptoms. An available blood test can help you determine your predisposition to dying from the novel coronavirus infection in·fec·tion | \ in-ˈfek-shən a : the state produced by the establishment of one or more pathogenic agents (such as a bacteria, protozoans, or viruses) in or on the body of a suitable host b : a disease resulting from infection.