For example, it would be very important to better explain the mortality rate of this virus, to genotype all subjects who died from COVID-19 for factor V Leiden (FVL) and prothrombin G20210A mutation (PTM),which are considered the two most common genetic polymorphisms known to increase the risks of thromboembolism [56,57,58,59,60]. Here, F2 is linked to COVID-19.