[cyberax]

cVDPV outbreaks die out on their own, and the newer vaccines are designed to be less likely to escape.

People also don't carry the virus for decades. That's a myth. People with a weakened immune system can get infected with polio even after a childhood vaccination, so that's probably where this myth comes from.

[mgraczyk]

It's not a myth at all, off the top of my head I know of at least two cases studies including the study that led to the discovery that remdesivir may treat polio

https://pmc.ncbi.nlm.nih.gov/articles/PMC10022663/

Immunocompromised hosts can shed infectious polio for their entire lives.

These outbreaks sometimes die on their own, but there's no reason to believe they wouldn't spread widely if we completely stopped vaccinating