"derived from vaccine" to me implies this is not the normal polio. it sounds like it is polio vaccines that mutated to infect ppl and the protection from the polio vax is not working any longer. otherwise it would not b a concern but considered normal, just like finding plastic particles or meds in water nowadays is.

now why would they b testing for these other viruses not just covid? what are they looking for? merges and mutations caused by covid and/or the vax. u don't look for a fire in the ocean, less u know there is 1 there. u don't look and report on fish, either less it's JAWS.