On January 20, 2020, the first case of COVID-19 emerged in the United States. More than 30 months on, the pandemic is still considered ongoing. COVID-19, whose official name is coronavirus disease 2019, is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2 virus). The COVID-19 pandemic’s continuation and severity are mainly due to the virus’s fast mutations and its many variants. As a type of RNA virus, SARS-CoV-2 has a very high mutation rate. This is because the RNA polymerase that replicates the virus’s genes doesn’t have excellent proofreading skills. However, this actually helps the virus by allowing its variants to find new hosts and escape immunity induced by vaccination or previous in…