Studies have reported different diseases that can predispose the individual to COVID-19 and reported that malnutrition [30], serum parameters, such as blood group [31], and elevated plasmin(ogen) [32], as well as underlying autoimmune diseases, such as tuberculosis [33] and lupus erythematosus [34] can increase patients’ susceptibility to COVID-19. The gene discussed is PLG; the disease is malnutrition.