As of August 6, 2021, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which is the virus responsible for the coronavirus disease 2019 (COVID-19), has infected over 201 million people and caused the deaths of almost 4.3 million worldwide.
The high transmissibility and unpredictable nature of SARS-CoV-2 has supported the rapid development of several COVID-19 vaccines that have already been distributed in many countries around the world. To date, almost 30% of the world’s population has received at least one dose of a COVID-19 vaccine.
