Even if there is a vaccines for Covid, I will not be able to inject it immediately, i will look first at what side effect it will have in the human body.
You should even do some searches about it or maybe ask someone about it since until now we are still not being given or being announced about a vaccine that went through phase III of its testings. We don't know how long will we wait for the vaccine, all we know that there are a lot of them being developed and in the tests now.