Before this whole pandemic, there was already a coronavirus vaccine that was developed for SARS and MERS and could be produced in 20 facilities around the world. The U.S. government chose not to pursue this as part of Operation Warp Speed. I believe this is because older technology is less profitable and harder to obtain patents and trade secrets. When I posted this link on Facebook, there was no preview image, and not a single person reacted or commented.
https://www.jefferson.edu/about/news-an ... emand.html