s of August 9, 2021, about 59% and 50% of the total population of the United States (US) have received at least one dose of COVID-19 vaccines and been fully vaccinated with COVID-19  vaccines, respectively [Centers for Disease Control and Prevention (CDC)]. However, the rates of full vaccination across the country are uneven. The vaccination rates vary from over 70% in the District of Columbia to around 35% in Alabama (Johns Hopkins Coronavirus Resource Center). In addition, the pace of COVID-19 vaccination in the US has also slowed. The administration of COVID-19 vaccines peaked in early April 2021 with over 4 million shots being given on April 8. As of August 9, the 7-day average new doses of COVID-19 vaccines was only about 0.53 million (CDC). Not only in the US, such trends are also found in other countries such as Canada. To date, over 70% and 60% of the Canadian population have received at least one dose of COVID-19 vaccines and....