From what I have read, developing a vaccine for the Coronavirus didn't just begin in 2019, but more than ten years ago. A group of doctors formed a consortium to put their money together to do the groundwork, experiments and testing, which according to them, the vaccine was able to be delivered in under a year. Most of us, if not all, thought the scientists started from scratch developing the vaccine, but now it appears that maybe it was already in the making over ten years ago.
According to one of the doctors in the consortium, if more people knew or were made aware that the vaccine for coronaviruses has been an ongoing venture for over a decade now, maybe vaccine hesitancy would be less than what it is. Take a look:
Coronaviruses Vaccine