What? No vaccines were available a year and half ago.
The Phase 1 clinical trials began March 16, 2020. That’s when the first doses were given.
So yes, some people have been vaccinated throughout that whole time. More were vaccinated when the Phase 2 clinical trials began in the spring, and even more last summer. Tens of thousands in the US alone. Over 100,000 participated in the clinical trials between the US and the UK alone.