Have you ever considered that maybe the reason covid-19 affects people so differently could be due to their personal genetic makeup? Researchers have been looking into this hypothesis, and have found patterns of certain genes being responsible for severe cases of the disease. Another thing that could affect the severity could be your blood type, according to researchers. In a study done in Spain and Italy, researchers found subtle common similarities between those patients who developed respiratory failure. That similarity was that they had "variants in a complex of genes on chromosome 3." These genes are often used to encode proteins (chemokines), and these proteins interact with the immune system molecules. This all makes sense seeing that the immune system is mostly responsible for how well you handle covid-19. One problem with these statements however, is that the genes being used and studied are based on biased data sets, only using the research from this small trial. However, I do think that this could be the reason that the illness is so feared. We can conclude that it affects those of older age, and with previous health conditions worse than those without, but there are some instances where it aggressively attacks a healthy, young person. Why would this be? Maybe it is because of their genes.