1. Different COVID-19 Vaccines: Centers for Disease Control and Prevention. CDCG; 2021. Available from: https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines.html. [Last accessed on 2021 Nov 02].
2. Johns Hopkins University. Center for Systems Science and Engineering. COVID-19 [Internet]. United States of America: Center for Systems Science and Engineering; 2020. Available from: https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6. [Last accessed on 2021 Nov 02].
3. A strategic approach to COVID-19 vaccine R&D;Corey;Science,2020
4. Use of Pfizer-BioNTech COVID-19 vaccine in persons aged ≥16 years: Recommendations of the Advisory Committee on Immunization Practices – United States, September 2021;Dooling;MMWR Morb Mortal Wkly Rep,2021
5. COVID-19 Diagnostic Testing. Mayo Clinic; 2021. Available from: https://www.mayoclinic.org/tests-procedures/covid-19-diagnostic-test/about/pac-20488900. [Last accessed on 2021 Nov 02].