I agree it is really fast, but I have trust in our regulatory agencies and others in the world. The major vaccines are so popular worldwide, all major industrialized countries will be doing their own testing and collecting their own data. If somethings wrong with it, we'll hear about it. I guess whats the worst case scenario? It gives you covid instead of preventing it. I mean i doubt the long term side effects could really be that bad. But i have no knowledge or expertise in this matter so...