Millions of people have been vaccinated all over the world and by now you're probably at least somewhat acquainted with the two vaccines that have been emergency-approved in the USA. But did you know there are 64 vaccines currently in clinical trials and 10 that have been approved in some country in the world? What is the deal with those vaccines?
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References:

https://ourworldindata.org/covid-vaccinations
https://www.sciencedirect.com/science/article/pii/S0140673620326611?via%3Dihub
https://www.fiercebiotech.com/biotech/j-j-erring-caution-tests-new-two-dose-regimen-for-covid-vaccine
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)32156-5/fulltext
https://www.bcm.edu/research/research-services/service-labs/vector-development/adenovirus-vectors/ad5-vectors
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4564586/
https://science.sciencemag.org/content/368/6494/945.full
https://www.sciencedirect.com/science/article/pii/S0092867420302622
https://science.sciencemag.org/content/369/6510/1501
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7672035/
https://www.sciencemag.org/news/2020/12/development-unique-australian-covid-19-vaccine-halted