I don't think the vaccine failed, apparently it recombined and now 80% of the world's polio is now bill gates edition lol.
Keeping problems around seems to be the goal of vaccines imo.
Instead of abandoning the ineffective vaccines the polio disease was reclassified (a disease with a residual paralysis resolving within 60 days changed into a disease with residual paralysis persisting for more than 60 days, seemingly resulting in eradication of 90% cases, since the majority of polio paralysis cases resolved within 60 days) and new names introduced: Guillain-Barre syndrome, ascending paralysis, viral meningitis.
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