In that type of vaccine, it's exactly as you say. They kill the virus with heat or chemicals, then introduce dead virus into the body. The human body learns the

In that type of vaccine, it's exactly as you say. They kill the virus with heat or chemicals, then introduce dead virus into the body. The human body learns the structures on the surface of the virus, recognizes those structures as bad, and releases antibodies if they ever reappear. It's like someone showing you a dead man and saying "he is survived by an identical twin brother that is wanted for murder."