Why not inject us with dead CV19 for our immune system to practice on?
My understand is that we are getting attacked by viruses all the time, but our system has seen them before so no worries. It the ones that we have not seen before that's the problem. With the flu shots we get dead viruses are given for our immune system to practice on so when the real thing come along
it know what to do. So why can't the same thing be done with covdid-19?