You cannot kill a virus because viruses are not alive. What is a virus? A virus is a piece of genetic material wrapped in a sack that invades the body. They go into the cells and latch onto the machinery of the cells (usually the DNA), and they use our own body’s is energy to replicate.
You cannot kill a virus, but it does not have a life force but you can definitely acquire a virus get sick and then once your body deals with that virus it does not necessarily kill it because it is not a live, it goes into remission, it goes in a dormant stage. That is called a latent virus.