Some viruses, like SARS-CoV-2 can mutate very quickly, as we have seen during the pandemic - the virus has actually mutated several times within the course of a single year! This not only exemplifies how viruses demonstrate evolution, but it also shows how pandemics, such as COVID-19, can be extraordinarily difficult to end. Viruses are able to mutate their own genetic code, making many vaccines ineffective, as vaccines function based on a prediction of a virus’s genetic sequence. Throughout the years of 2020 and 2021, many vaccinations were found to become ineffective shortly after implementation as a result of the coronavirus’s ability to mutate. According to a Today news article, there were several different COVID-19 variants which had been discovered. More specifically, variants of the virus known as SARS-CoV-2 have emerged from the U.S. to the U.K. to South Africa and Brazil. As shown by this pandemic, a virus displays a remarkable ability to evolve quicker than humans could ever imagine. Their ability to evolve quicker than vaccines are produced allow them to continue to harm populations of individuals. As these viruses mutate and evolve, scientists are discovering more methods of protecting the public. As of 2021, the Food and Drug Administration has authorized the use of the Pfizer, Moderna, and Johnson and Johnson booster shots for the coronavirus. Booster shots are defined as “an additional dose of a vaccine given after the protection provided by the original shot(s) has begun to decrease over time” (Magakris & Kelen, 2021). These booster shots can reinforce the efficacy of the original vaccination, supporting the end of the pandemic.