There is zero virus lethality. The reason is simple. Viruses, unlike bacteria and fungi, do not produce toxins. Viruses do not have a mechanism that can harm the human body.

A bacteria or fungi can eat a substance of your body, metabolize it and excrete a toxin. Thus the toxin harms the body. This is a pathogenic mechanism.

A virus is simply information. RNA, DNA, it doesn't matter. It's information. The body then receives this information and decides whether it's useful or not useful. If it's not useful it stops the propagation of its message. If the body is malfunctioning due to lack of certain nutrients and vitamins, then the body can self-harm itself while trying to clean the virus. For example ebola symptoms are due to lack of selenium. Covid symptoms lack of vitD. You fix your body deficiencies and thus your body will stop attacking your body which is the source of the pathogenity.

Virus pathogenity is merely an information trigger that makes the body attack itself IF the body lacks nutrients and vitamins. If it doesn't lack nutrients and vitamins the virus is quickly discarded as useless information.