[zer0n1ght]

Viruses don't usually do any damage to the body. It's the immune system's response to virus that causes damage. The immune system releases chemicals into the blood stream (inflammation) and the increase of these chemicals in the blood reduces oxygen transport. If left unchecked, these chemicals can cause sepsis, and the lack of oxygen causes organ failure, and that is how a virus becomes lethal. These inflammatory chemicals produced by your immune system are what gets trapped in the lungs as pneumonia, which causes other issues. So controlling inflammation and reducing the viral population is the key to survival.