I never asked for 100% proof of its existence. I'm very sure there isn't *any* valid evidence for it so 100% proof would be an infinite number of bridges too far.
As for my own proof of its non-existence I don't have to provide such a thing but not only do I, nonetheless, have this proof I can actually prove - using irrefutable logic - that *no* pathogenic viruses exist.
These posts tend to get deleted but if you want the general idea of this proof you should watch the Disney movie "Fantasia".