Just in case anyone is concerned about how fast the COVID-19 vaccines were produced: it is because they are variants of the SARS vaccine, which we've had for more than a decade.
COVID-19 can be treated with a variant of the SARS vaccine because COVID-19 is a variant of SARS. The virus that causes SARS is SARS-CoV, and the 2019 novel coronavirus is SARS-CoV-2.
Because of this, researchers had a vaccine ready for testing as early as January 2020. The COVID-19 vaccine had, in fact, nearly a full year of testing and refinement. It is not by any means "experimental" or "untested".
@noelle and to answer the other question people have: they can run the different stages of the drug trials almost simultaneously, that makes the process a lot faster. especially if you have a LOT of subjects and a LOT of opportunities to be infected.
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