You pointed ti an essential problem. Everybody wants a top - quality vaccine. However these days mutations are on the move. It has been already shown the the vaccine of Astra- Zeneca is not that good for the mutant virus in South - Africa. I think now the only option we have is to take two different types of vaccines:
Combining different coronavirus shots could speed immunization campaigns — and even boost immune response. News, Nature 590, 375-376 (2021), Open access: https://www.nature.com/articles/d41586-021-00315-5
2) Mohamed Boudjelal et al. (2021). COVID-19 Vaccines: Global Challenges and Prospects Forum Recommendations, International Journal of Infectious Diseases
Available online 27 February 2021, In Press, Journal Pre-proof Open access:
Article COVID-19 Vaccines: Global Challenges and Prospects Forum Rec...
3) A case-study: Jeanine P.D. Guidry PhD et al. (2021).Willingness to get the COVID-19 vaccine with and without emergency use authorization, American Journal of Infection Control, Volume 49, Issue 2, February 2021, Open access:
Article Willingness to get the COVID-19 vaccine with and without eme...