I have not seen proof that corona jumps through other species.
I heard a report that one cat, or maybe it was a dog? That caught it, and a bunch of BS about pangolins.
But it was designed specifically for humans.
Designed from what? Do you remember that part?
You are confusing some issues here. The the type of enterovirus responsible for polio is not zoonotic. Humans have it and its passed from humans to humans.
The types of corona that were cobbled together to spur the plandemic is zoonotic, the fact that there is no known natural reservoir for the one they made is not in question. The reason that they were able to claim at different times that ALL dogs had it or that ALL cats, or ALL the cattle, or pangolins, and fruit bats, and a bunch of other crap had potentially spread the frankenvirus is because all kinds of things get various illnesses from corona virus and it eventually can potentially jump to people.
You remember all the hysteria about this or that bird flu? That is of course an influenza virus and influenza is zoonotic. The swine flu? It jumps back and forth from ducks to pigs over and over continually mutating until it finds a new form that can infect humans. No one is actually worried about the well being of the population of starlings worldwide.
A duck is not going to fly by and give you anything that will cause polio, in theory something like a weasel could carry a new deadly form of cold like the one that killed off many of our ancestors long ago.