1. Worldometer COVID-19 Coronavirus Pandemic. https://www.worldometers.info/coronavirus/#countries. Accessed on September 6, 2021.
2. UNICEF COVID-19 Vaccine Market Dashboard. https://www.unicef.org/supply/covid-19-vaccine-market-dashboard. Accessed on September 6, 2021.
3. Why a pioneering plan to distribute COVID vaccines equitably must succeed;Nature,2021
4. WHO. Evaluation of COVID-19 vaccine effectiveness interim guidance, Geneva, March 2021. Available at https://apps.who.int/iris/handle/10665/340301. Accessed on September 6, 2021.
5. Antibody responses after COVID-19 infection in patients who are mildly symptomatic or asymptomatic in Bangladesh;Shirin;Int J Infect Dis,2020