 The Delta variant of COVID-19, also known as B.1.617.2, is much more contagious than its predecessor, the Alpha variant. It is estimated to be 60% more transmissible than the Alpha variant, which has been the predominant strain since the beginning of the pandemic. Despite countries such as the United States having a high rate of vaccination, the virus has still managed to make a comeback due to the increased transmissibility of the Delta variant. Vaccine manufacturers have reported that their vaccines are effective against the Delta variant, but with a lower efficacy compared to the Alpha variant.